diff --git a/.gitignore b/.gitignore
index 5e7b1b5a..e50de2eb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ composer.phar
 /vendor/
 docs/reactivex.github.io
 build/
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diff --git a/.phpunit.result.cache b/.phpunit.result.cache
new file mode 100644
index 00000000..ef9222c6
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_does_not_call_on_next_after_completion":0,"Rx\\Observer\\ScheduledObserverTest::it_does_not_call_on_completed_after_completion":0,"Rx\\Observer\\ScheduledObserverTest::it_does_not_call_on_error_after_completion":0,"Rx\\Observer\\ScheduledObserverTest::throw_inside_onnext_throws":0,"Rx\\Scheduler\\EventLoopSchedulerTest::now_returns_time_since_epoch_in_ms":0.003,"Rx\\Scheduler\\EventLoopSchedulerTest::eventloop_schedule":0.004,"Rx\\Scheduler\\EventLoopSchedulerTest::eventloop_schedule_recursive":0.001,"Rx\\Scheduler\\EventLoopSchedulerTest::testDisposedEventDoesNotCauseSkip":0,"Rx\\Scheduler\\EventLoopSchedulerTest::testSchedulerWorkedWithScheduledEventOutsideItself":0.201,"Rx\\Scheduler\\EventLoopSchedulerTest::testScheduledItemsFromOutsideOfSchedulerDontCreateExtraTimers":0.043,"Rx\\Scheduler\\EventLoopSchedulerTest::testMultipleSchedulesFromOutsideInSameTickDontCreateExtraTimers":0.041,"Rx\\Scheduler\\EventLoopSchedulerTest::testThatStuffScheduledWayInTheFutureDoesntKeepTheLoopRunningIfDisposed":0.01,"Rx\\Scheduler\\EventLoopSchedulerTest::testThatDisposalOfSingleScheduledItemOutsideOfInvokeCancelsTimer":0.01,"Rx\\Scheduler\\EventLoopSchedulerTest::testScheduledItemPastNextScheduledItemKillsItOwnTimerIfItBecomesTheNextOneAndIsDisposed":0.05,"Rx\\Scheduler\\ImmediateSchedulerTest::now_returns_the_time":0.001,"Rx\\Scheduler\\ImmediateSchedulerTest::non_zero_delay_throws":0.001,"Rx\\Scheduler\\ImmediateSchedulerTest::schedule_periodic_throws":0.001,"Rx\\Scheduler\\PriorityQueueTest::it_should_remove_a_scheduled_item":0.001,"Rx\\Scheduler\\PriorityQueueTest::it_orders_the_items":0,"Rx\\Scheduler\\PriorityQueueTest::peek_returns_the_top_item":0,"Rx\\Scheduler\\PriorityQueueTest::dequeue_removes_the_top_item_from_the_queue":0,"Rx\\Scheduler\\PriorityQueueTest::first_scheduled_item_with_same_priority_comes_first":0,"Rx\\Scheduler\\PriorityQueueTest::can_remove_scheduled_items_out_of_order":0.001,"Rx\\Scheduler\\PriorityQueueTest::should_not_remove_nonexistent_item":0.015,"Rx\\SchedulerTest::testGetDefaultThrowsIfNotSet":0,"Rx\\SchedulerTest::testSetDefault":0,"Rx\\SchedulerTest::testSetDefaultTwiceBeforeGet":0,"Rx\\SchedulerTest::testSetAsync":0,"Rx\\SchedulerTest::testSetAsyncTwiceBeforeGet":0,"Rx\\SchedulerTest::testSetDefaultTwiceThrowsException":0,"Rx\\SchedulerTest::testSetAsyncTwiceThrowsException":0,"Rx\\SchedulerTest::testGetAsyncBeforeSet":0,"Rx\\SchedulerTest::testGetAsyncAfterSettingDefaultToAsync":0,"Rx\\SchedulerTest::testAsyncSchedulerFactorReturnsNonAsyncScheduler":0.001,"Rx\\SchedulerTest::testDefaultSchedulerFactorReturnsNonScheduler":0,"Rx\\SchedulerTest::testAsyncSchedulerFactorThrowsNonAsyncDefaultScheduler":0,"Rx\\Subject\\BehaviorSubjectTest::it_throws_when_subscribing_to_a_disposed_subject":0.018,"Rx\\Subject\\BehaviorSubjectTest::it_exposes_if_it_has_observers":0.002,"Rx\\Subject\\BehaviorSubjectTest::it_exposes_if_it_is_disposed":0,"Rx\\Subject\\BehaviorSubjectTest::it_has_no_observers_after_disposing":0,"Rx\\Subject\\BehaviorSubjectTest::it_returns_true_if_an_observer_is_removed":0,"Rx\\Subject\\BehaviorSubjectTest::it_returns_false_if_an_observer_is_not_subscribed":0,"Rx\\Subject\\BehaviorSubjectTest::it_passes_exception_on_subscribe_if_already_stopped":0.005,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_complete_on_subscribe_if_already_stopped":0,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_error_if_not_disposed":0.001,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_complete_if_not_disposed":0.001,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_next_if_not_disposed":0.001,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_next_if_not_disposed_with_init":0,"Rx\\Subject\\BehaviorSubjectTest::it_does_not_pass_if_already_stopped":0,"Rx\\Subject\\BehaviorSubjectTest::it_throws_on_error_if_disposed":0,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_complete_if_disposed":0,"Rx\\Subject\\BehaviorSubjectTest::it_passes_on_next_if_disposed":0,"Rx\\Subject\\SubjectTest::it_throws_when_subscribing_to_a_disposed_subject":0,"Rx\\Subject\\SubjectTest::it_exposes_if_it_has_observers":0,"Rx\\Subject\\SubjectTest::it_exposes_if_it_is_disposed":0,"Rx\\Subject\\SubjectTest::it_has_no_observers_after_disposing":0,"Rx\\Subject\\SubjectTest::it_returns_true_if_an_observer_is_removed":0,"Rx\\Subject\\SubjectTest::it_returns_false_if_an_observer_is_not_subscribed":0,"Rx\\Subject\\SubjectTest::it_passes_exception_on_subscribe_if_already_stopped":0,"Rx\\Subject\\SubjectTest::it_passes_on_complete_on_subscribe_if_already_stopped":0,"Rx\\Subject\\SubjectTest::it_passes_on_error_if_not_disposed":0,"Rx\\Subject\\SubjectTest::it_passes_on_complete_if_not_disposed":0,"Rx\\Subject\\SubjectTest::it_passes_on_next_if_not_disposed":0,"Rx\\Subject\\SubjectTest::it_does_not_pass_if_already_stopped":0,"Rx\\Subject\\SubjectTest::it_throws_on_error_if_disposed":0,"Rx\\Subject\\SubjectTest::it_passes_on_complete_if_disposed":0,"Rx\\Subject\\SubjectTest::it_passes_on_next_if_disposed":0,"Rx\\Testing\\HotObservableTest::testRemovingObserverThatNeverSubscribed":0.014,"Rx\\Testing\\RecordedTest::testRecordedWillUseStrictCompareIfNoEqualsMethod":0.001,"Rx\\Testing\\RecordedTest::testRecordedToString":0.002,"Rx\\Testing\\SubscriptionTest::testSubscriptionGetters":0,"Rx\\Testing\\SubscriptionTest::testSubscriptionToString":0,"Rx\\TimestampedTest::testEqualWithScalar":0,"Rx\\TimestampedTest::testNotEqualWithScalar":0,"Rx\\TimestampedTest::testNotEqualInTime":0,"Rx\\TimestampedTest::testEqualNotATimestamp":0,"Rx\\TimestampedTest::testEqualSameTimestamp":0,"Rx\\TimestampedTest::testEqualObjectSameInstance":0,"Rx\\TimestampedTest::testNotEqualObjectDiffentInstance":0,"Rx\\TimestampedTest::testGetValue":0}}
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 79921091..d30209d3 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         }
     ],
     "require": {
-        "php": ">=7.0.0",
+        "php": ">=8.2",
         "react/promise": "^3 || ~2.2"
     },
     "require-dev": {
diff --git a/demo/create/createObservable.php b/demo/create/createObservable.php
index bf0bd067..99f55125 100644
--- a/demo/create/createObservable.php
+++ b/demo/create/createObservable.php
@@ -1,11 +1,13 @@
 <?php
 
 use Rx\Disposable\CallbackDisposable;
+use Rx\Observable\AnonymousObservable;
+use Rx\ObserverInterface;
 
 require_once __DIR__ . '/../bootstrap.php';
 
 //With Class
-$source = new \Rx\Observable\AnonymousObservable(function (\Rx\ObserverInterface $observer) {
+$source = new AnonymousObservable(function (ObserverInterface $observer) {
     $observer->onNext(42);
     $observer->onCompleted();
 
diff --git a/demo/custom-operator/Rot13Operator.php b/demo/custom-operator/Rot13Operator.php
index 7476e6b5..089d266b 100644
--- a/demo/custom-operator/Rot13Operator.php
+++ b/demo/custom-operator/Rot13Operator.php
@@ -15,11 +15,9 @@ class Rot13Operator implements OperatorInterface
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         return $observable->subscribe(
-            function ($json) use ($observer) {
-                $observer->onNext(str_rot13($json));
-            },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($json) => $observer->onNext(str_rot13($json)),
+            fn ($e) => $observer->onError($e),
+            fn () => $observer->onCompleted()
         );
     }
 }
\ No newline at end of file
diff --git a/demo/zip/zip.php b/demo/zip/zip.php
index 1ea94175..076bc8b5 100644
--- a/demo/zip/zip.php
+++ b/demo/zip/zip.php
@@ -20,6 +20,6 @@
         function ($array) use ($observer) {
             $observer->onNext(json_encode($array));
         },
-        [$observer, 'onError'],
-        [$observer, 'onCompleted']
+        fn ($e) => $observer->onError($e),
+        fn () => $observer->onCompleted()
     ));
diff --git a/src/Disposable/BinaryDisposable.php b/src/Disposable/BinaryDisposable.php
index 2197cc5b..737a9399 100644
--- a/src/Disposable/BinaryDisposable.php
+++ b/src/Disposable/BinaryDisposable.php
@@ -6,33 +6,16 @@
 
 use Rx\DisposableInterface;
 
-/**
- * Class BinaryDisposable
- * @package Rx\Disposable
- */
 class BinaryDisposable implements DisposableInterface
 {
-    /** @var \Rx\DisposableInterface */
-    private $first;
-
-    /** @var \Rx\DisposableInterface */
-    private $second;
-
-    /** @var bool */
-    protected $isDisposed = false;
-
-    /**
-     * BinaryDisposable constructor.
-     * @param $first
-     * @param $second
-     */
-    public function __construct(DisposableInterface $first, DisposableInterface $second)
-    {
-        $this->first  = $first;
-        $this->second = $second;
+    public function __construct(
+        private null|DisposableInterface $first,
+        private null|DisposableInterface $second,
+        protected bool $isDisposed = false
+    ) {
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->isDisposed) {
             return;
diff --git a/src/Disposable/CallbackDisposable.php b/src/Disposable/CallbackDisposable.php
index 0198b8d9..d87a77da 100644
--- a/src/Disposable/CallbackDisposable.php
+++ b/src/Disposable/CallbackDisposable.php
@@ -8,15 +8,13 @@
 
 class CallbackDisposable implements DisposableInterface
 {
-    private $action;
-    private $disposed = false;
-
-    public function __construct(callable $action)
-    {
-        $this->action = $action;
+    public function __construct(
+        private \Closure $action,
+        private bool $disposed = false
+    ) {
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->disposed) {
             return;
diff --git a/src/Disposable/CompositeDisposable.php b/src/Disposable/CompositeDisposable.php
index 3a6621bf..bb8e274d 100644
--- a/src/Disposable/CompositeDisposable.php
+++ b/src/Disposable/CompositeDisposable.php
@@ -8,15 +8,14 @@
 
 class CompositeDisposable implements DisposableInterface
 {
-    private $disposables;
-    private $isDisposed = false;
 
-    public function __construct(array $disposables = [])
-    {
-        $this->disposables = $disposables;
+    public function __construct(
+        private array $disposables = [],
+        private bool $isDisposed = false
+    ) {
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->isDisposed) {
             return;
@@ -32,7 +31,7 @@ public function dispose()
         }
     }
 
-    public function add(DisposableInterface $disposable)
+    public function add(DisposableInterface $disposable): void
     {
         if ($this->isDisposed) {
             $disposable->dispose();
@@ -65,12 +64,12 @@ public function contains(DisposableInterface $disposable): bool
         return in_array($disposable, $this->disposables, true);
     }
 
-    public function count()
+    public function count(): int
     {
         return count($this->disposables);
     }
 
-    public function clear()
+    public function clear(): void
     {
         $disposables       = $this->disposables;
         $this->disposables = [];
diff --git a/src/Disposable/EmptyDisposable.php b/src/Disposable/EmptyDisposable.php
index badc4cd3..a00e183e 100644
--- a/src/Disposable/EmptyDisposable.php
+++ b/src/Disposable/EmptyDisposable.php
@@ -8,7 +8,7 @@
 
 class EmptyDisposable implements DisposableInterface
 {
-    public function dispose()
+    public function dispose(): void
     {
         // do nothing \o/
     }
diff --git a/src/Disposable/RefCountDisposable.php b/src/Disposable/RefCountDisposable.php
index 59d0e67d..4174213d 100644
--- a/src/Disposable/RefCountDisposable.php
+++ b/src/Disposable/RefCountDisposable.php
@@ -8,17 +8,16 @@
 
 class RefCountDisposable implements DisposableInterface
 {
-    private $count = 0;
-    private $disposable;
-    private $isDisposed = false;
-    private $isPrimaryDisposed = false;
 
-    public function __construct(DisposableInterface $disposable)
-    {
-        $this->disposable = $disposable;
+    public function __construct(
+        private readonly DisposableInterface $disposable,
+        private int                          $count = 0,
+        private bool                         $isDisposed = false,
+        private bool                         $isPrimaryDisposed = false
+    ) {
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->isDisposed) {
             return;
@@ -32,13 +31,13 @@ public function dispose()
         }
     }
 
-    public function getDisposable()
+    public function getDisposable(): DisposableInterface|CallbackDisposable
     {
         if (!$this->isDisposed) {
             return $this->createInnerDisposable();
         }
 
-        return new CallbackDisposable(function () {
+        return new CallbackDisposable(function (): void {
         }); // no op
     }
 
@@ -57,7 +56,7 @@ private function createInnerDisposable(): DisposableInterface
         $this->count++;
         $isInnerDisposed = false;
 
-        return new CallbackDisposable(function () use (&$isInnerDisposed) {
+        return new CallbackDisposable(function () use (&$isInnerDisposed): void {
             if ($this->isDisposed()) {
                 return;
             }
diff --git a/src/Disposable/ScheduledDisposable.php b/src/Disposable/ScheduledDisposable.php
index 3e6372eb..d8c15bd4 100644
--- a/src/Disposable/ScheduledDisposable.php
+++ b/src/Disposable/ScheduledDisposable.php
@@ -9,22 +9,14 @@
 
 class ScheduledDisposable implements DisposableInterface
 {
-    /** @var DisposableInterface */
-    private $disposable;
-
-    /** @var SchedulerInterface */
-    private $scheduler;
-
-    /** @var bool */
-    protected $isDisposed = false;
-
-    public function __construct(SchedulerInterface $scheduler, DisposableInterface $disposable)
-    {
-        $this->scheduler  = $scheduler;
-        $this->disposable = $disposable;
+    public function __construct(
+        private SchedulerInterface   $scheduler,
+        private  DisposableInterface $disposable,
+        protected bool               $isDisposed = false
+    ) {
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->isDisposed) {
             return;
@@ -32,7 +24,7 @@ public function dispose()
 
         $this->isDisposed = true;
 
-        $this->scheduler->schedule(function () {
+        $this->scheduler->schedule(function (): void {
             $this->disposable->dispose();
         });
     }
diff --git a/src/Disposable/SerialDisposable.php b/src/Disposable/SerialDisposable.php
index 30f8e863..1de04a6b 100644
--- a/src/Disposable/SerialDisposable.php
+++ b/src/Disposable/SerialDisposable.php
@@ -6,19 +6,13 @@
 
 use Rx\DisposableInterface;
 
-/**
- * Class SerialDisposable
- * @package Rx\Disposable
- */
 class SerialDisposable implements DisposableInterface
 {
-    /** @var bool */
-    private $isDisposed = false;
+    private bool $isDisposed = false;
 
-    /** @var DisposableInterface */
-    private $disposable = null;
+    private ?DisposableInterface $disposable = null;
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->isDisposed) {
             return;
@@ -33,18 +27,12 @@ public function dispose()
         }
     }
 
-    /**
-     * @return DisposableInterface
-     */
-    public function getDisposable()
+    public function getDisposable(): null|DisposableInterface
     {
         return $this->disposable;
     }
 
-    /**
-     * @param DisposableInterface $disposable
-     */
-    public function setDisposable(DisposableInterface $disposable)
+    public function setDisposable(DisposableInterface $disposable): void
     {
         $shouldDispose = $this->isDisposed;
 
diff --git a/src/Disposable/SingleAssignmentDisposable.php b/src/Disposable/SingleAssignmentDisposable.php
index cbf5ddaa..6b2fc4ae 100644
--- a/src/Disposable/SingleAssignmentDisposable.php
+++ b/src/Disposable/SingleAssignmentDisposable.php
@@ -9,10 +9,10 @@
 
 class SingleAssignmentDisposable implements DisposableInterface
 {
-    private $current;
-    private $isDisposed = false;
+    private null|DisposableInterface $current = null;
+    private bool $isDisposed = false;
 
-    public function dispose()
+    public function dispose(): void
     {
         $old = null;
 
@@ -27,7 +27,7 @@ public function dispose()
         }
     }
 
-    public function setDisposable(DisposableInterface $disposable = null)
+    public function setDisposable(DisposableInterface $disposable = null): void
     {
         if ($this->current) {
             throw new RuntimeException('Disposable has already been assigned.');
@@ -42,12 +42,12 @@ public function setDisposable(DisposableInterface $disposable = null)
         }
     }
 
-    public function getDisposable()
+    public function getDisposable(): null|DisposableInterface
     {
         return $this->current;
     }
 
-    public function isDisposed()
+    public function isDisposed(): bool
     {
         return $this->isDisposed;
     }
diff --git a/src/Notification.php b/src/Notification.php
index 6e7d60cd..2a131964 100644
--- a/src/Notification.php
+++ b/src/Notification.php
@@ -9,14 +9,12 @@
  */
 abstract class Notification
 {
-    private $kind;
 
     /**
      * @param mixed $kind Kind of notification
      */
-    public function __construct($kind)
+    public function __construct(private $kind)
     {
-        $this->kind = $kind;
     }
 
     public function accept($observerOrOnNext, $onError = null, $onCompleted = null)
@@ -24,7 +22,7 @@ public function accept($observerOrOnNext, $onError = null, $onCompleted = null)
         if (null === $onError && null === $onCompleted && $observerOrOnNext instanceof ObserverInterface) {
             $this->doAcceptObservable($observerOrOnNext);
 
-            return;
+            return null;
         }
 
         return $this->doAccept($observerOrOnNext, $onError, $onCompleted);
@@ -32,7 +30,7 @@ public function accept($observerOrOnNext, $onError = null, $onCompleted = null)
 
     public function equals($other): bool
     {
-        return (string)$this === (string)$other;
+        return (string) $this === (string)$other;
     }
 
     abstract protected function doAcceptObservable(ObserverInterface $observer);
diff --git a/src/Notification/OnErrorNotification.php b/src/Notification/OnErrorNotification.php
index c974ee1d..4927471e 100644
--- a/src/Notification/OnErrorNotification.php
+++ b/src/Notification/OnErrorNotification.php
@@ -9,7 +9,7 @@
 
 class OnErrorNotification extends Notification
 {
-    private $exception;
+    private \Throwable $exception;
 
     public function __construct(\Throwable $exception)
     {
diff --git a/src/Notification/OnNextNotification.php b/src/Notification/OnNextNotification.php
index 57f5f946..4985e4a9 100644
--- a/src/Notification/OnNextNotification.php
+++ b/src/Notification/OnNextNotification.php
@@ -9,9 +9,7 @@
 
 class OnNextNotification extends Notification
 {
-    private $value;
-
-    public function __construct($value)
+    public function __construct(private $value)
     {
         parent::__construct('N');
 
@@ -35,10 +33,8 @@ public function __toString(): string
 
     public function equals($other): bool
     {
-        if (($other instanceof $this) && is_object($this->value) && is_object($other->value)) {
-            if ($this->value instanceof $other->value && method_exists($this->value, "equals")) {
-                return $this->value->equals($other->value);
-            }
+        if (($other instanceof $this) && is_object($this->value) && is_object($other->value) && ($this->value instanceof $other->value && method_exists($this->value, "equals"))) {
+            return $this->value->equals($other->value);
         }
 
         return (string)$this === (string)$other;
diff --git a/src/Observable.php b/src/Observable.php
index a10d2e0d..b818f73d 100644
--- a/src/Observable.php
+++ b/src/Observable.php
@@ -84,7 +84,6 @@ abstract class Observable implements ObservableInterface
      * @param callable|ObserverInterface|null $onNextOrObserver
      * @param callable|null $onError
      * @param callable|null $onCompleted
-     * @return DisposableInterface
      * @throws \InvalidArgumentException
      *
      * @operator
@@ -103,7 +102,7 @@ public function subscribe($onNextOrObserver = null, callable $onError = null, ca
         $observer = new CallbackObserver(
             $onNextOrObserver === null
                 ? null
-                : function ($value) use ($onNextOrObserver, &$observer, &$disposable) {
+                : function ($value) use ($onNextOrObserver, &$observer, &$disposable): void {
                     try {
                         $onNextOrObserver($value);
                     } catch (\Throwable $throwable) {
@@ -120,10 +119,6 @@ public function subscribe($onNextOrObserver = null, callable $onError = null, ca
         return $disposable;
     }
 
-    /**
-     * @param ObserverInterface $observer
-     * @return DisposableInterface
-     */
     protected abstract function _subscribe(ObserverInterface $observer): DisposableInterface;
 
     /**
@@ -132,7 +127,6 @@ protected abstract function _subscribe(ObserverInterface $observer): DisposableI
      * @param callable|null $onNext
      * @param callable|null $onError
      * @param callable|null $onCompleted
-     * @return DisposableInterface
      */
     public function subscribeCallback(callable $onNext = null, callable $onError = null, callable $onCompleted = null): DisposableInterface
     {
@@ -176,7 +170,6 @@ public static function interval(int $interval, AsyncSchedulerInterface $schedule
      * Returns an observable sequence that contains a single element.
      *
      * @param mixed $value Single element in the resulting observable sequence.
-     * @param SchedulerInterface $scheduler
      * @return ReturnObservable An observable sequence with the single element.
      *
      * @demo of/of.php
@@ -194,7 +187,6 @@ public static function of($value, SchedulerInterface $scheduler = null): ReturnO
      *
      * @param $value
      * @param SchedulerInterface|null $scheduler
-     * @return ReturnObservable
      */
     public static function just($value, SchedulerInterface $scheduler = null): ReturnObservable
     {
@@ -204,7 +196,6 @@ public static function just($value, SchedulerInterface $scheduler = null): Retur
     /**
      * Returns an empty observable sequence.
      *
-     * @param SchedulerInterface $scheduler
      * @return EmptyObservable An observable sequence with no elements.
      *
      * @demo empty/empty.php
@@ -221,7 +212,6 @@ public static function empty(SchedulerInterface $scheduler = null): EmptyObserva
      * Alias for empty
      *
      * @param SchedulerInterface|null $scheduler
-     * @return EmptyObservable
      */
     public static function emptyObservable(SchedulerInterface $scheduler = null): EmptyObservable
     {
@@ -245,8 +235,6 @@ public static function never(): NeverObservable
     /**
      * Returns an observable sequence that terminates with an exception.
      *
-     * @param \Throwable $error
-     * @param SchedulerInterface $scheduler
      * @return ErrorObservable The observable sequence that terminates exceptionally with the specified exception object.
      *
      * @demo error-observable/error-observable.php
@@ -261,8 +249,6 @@ public static function error(\Throwable $error, SchedulerInterface $scheduler =
     /**
      * Combine an Observable together with another Observable by merging their emissions into a single Observable.
      *
-     * @param ObservableInterface $otherObservable
-     * @return Observable
      *
      * @demo merge/merge.php
      * @operator
@@ -270,7 +256,7 @@ public static function error(\Throwable $error, SchedulerInterface $scheduler =
      */
     public function merge(ObservableInterface $otherObservable): Observable
     {
-        return (new AnonymousObservable(function (ObserverInterface $observer) use ($otherObservable) {
+        return (new AnonymousObservable(function (ObserverInterface $observer) use ($otherObservable): void {
             $observer->onNext($this);
             $observer->onNext($otherObservable);
             $observer->onCompleted();
@@ -280,7 +266,6 @@ public function merge(ObservableInterface $otherObservable): Observable
     /**
      * Merges an observable sequence of observables into an observable sequence.
      *
-     * @return Observable
      *
      * @demo merge/merge-all.php
      * @operator
@@ -288,7 +273,7 @@ public function merge(ObservableInterface $otherObservable): Observable
      */
     public function mergeAll(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\MergeAllOperator {
             return new MergeAllOperator($this);
         });
     }
@@ -296,9 +281,6 @@ public function mergeAll(): Observable
     /**
      * Converts an array to an observable sequence
      *
-     * @param array $array
-     * @param SchedulerInterface $scheduler
-     * @return ArrayObservable
      *
      * @demo fromArray/fromArray.php
      * @operator
@@ -312,9 +294,6 @@ public static function fromArray(array $array, SchedulerInterface $scheduler = n
     /**
      * Converts an Iterator into an observable sequence
      *
-     * @param \Iterator $iterator
-     * @param SchedulerInterface $scheduler
-     * @return IteratorObservable
      *
      * @demo iterator/iterator.php
      * @operator
@@ -328,9 +307,6 @@ public static function fromIterator(\Iterator $iterator, SchedulerInterface $sch
     /**
      * Returns an observable sequence that invokes the specified factory function whenever a new observer subscribes.
      *
-     * @param callable $factory
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo defer/defer.php
      * @operator
@@ -339,7 +315,7 @@ public static function fromIterator(\Iterator $iterator, SchedulerInterface $sch
     public static function defer(callable $factory, SchedulerInterface $scheduler = null): Observable
     {
         return static::empty($scheduler)
-            ->lift(function () use ($factory) {
+            ->lift(function () use ($factory): \Rx\Operator\DeferOperator {
                 return new DeferOperator(new ObservableFactoryWrapper($factory));
             });
     }
@@ -350,8 +326,6 @@ public static function defer(callable $factory, SchedulerInterface $scheduler =
      *
      * @param $start
      * @param $count
-     * @param SchedulerInterface $scheduler
-     * @return RangeObservable
      * @throws \InvalidArgumentException
      *
      * @demo range/range.php
@@ -367,9 +341,6 @@ public static function range(int $start, int $count, SchedulerInterface $schedul
      * Invokes the specified function asynchronously on the specified scheduler, surfacing the result through an
      * observable sequence.
      *
-     * @param callable $action
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo start/start.php
      * @operator
@@ -380,7 +351,7 @@ public static function start(callable $action, SchedulerInterface $scheduler = n
         $scheduler = $scheduler ?? Scheduler::getDefault();
         $subject   = new AsyncSubject();
 
-        $scheduler->schedule(function () use ($subject, $action) {
+        $scheduler->schedule(function () use ($subject, $action): void {
             $result = null;
             try {
                 $result = $action();
@@ -398,8 +369,6 @@ public static function start(callable $action, SchedulerInterface $scheduler = n
     /**
      * Takes a transforming function that operates on each element.
      *
-     * @param callable $selector
-     * @return Observable
      *
      * @demo map/map.php
      * @operator
@@ -407,7 +376,7 @@ public static function start(callable $action, SchedulerInterface $scheduler = n
      */
     public function map(callable $selector): Observable
     {
-        return $this->lift(function () use ($selector) {
+        return $this->lift(function () use ($selector): \Rx\Operator\MapOperator {
             return new MapOperator($selector);
         });
     }
@@ -415,8 +384,6 @@ public function map(callable $selector): Observable
     /**
      * Maps operator variant that calls the map selector with the index and value
      *
-     * @param callable $selector
-     * @return Observable
      *
      * @demo map/mapWithIndex.php
      * @operator
@@ -434,7 +401,6 @@ public function mapWithIndex(callable $selector): Observable
      * Maps every value to the same value every time
      *
      * @param $value
-     * @return Observable
      *
      * @demo map/mapTo.php
      * @operator
@@ -450,8 +416,6 @@ public function mapTo($value): Observable
     /**
      * Alias for Map
      *
-     * @param callable $selector
-     * @return Observable
      *
      * @operator
      * @reactivex map
@@ -464,8 +428,6 @@ public function select(callable $selector): Observable
     /**
      * Emit only those items from an Observable that pass a predicate test.
      *
-     * @param callable $predicate
-     * @return Observable
      *
      * @demo filter/filter.php
      * @operator
@@ -473,7 +435,7 @@ public function select(callable $selector): Observable
      */
     public function filter(callable $predicate): Observable
     {
-        return $this->lift(function () use ($predicate) {
+        return $this->lift(function () use ($predicate): \Rx\Operator\FilterOperator {
             return new FilterOperator($predicate);
         });
     }
@@ -481,8 +443,6 @@ public function filter(callable $predicate): Observable
     /**
      * Alias for filter
      *
-     * @param callable $predicate
-     * @return Observable
      *
      * @operator
      * @reactivex filter
@@ -495,8 +455,6 @@ public function where(callable $predicate): Observable
     /**
      * Projects each element of an observable sequence to an observable sequence and merges the resulting observable sequences into one observable sequence.
      *
-     * @param callable $selector
-     * @return Observable
      *
      * @demo flatMap/flatMap.php
      * @operator
@@ -514,7 +472,6 @@ public function flatMap(callable $selector): Observable
      * @param ObservableInterface $observable - An an observable sequence to project each element from the source
      * sequence onto.
      *
-     * @return Observable
      *
      * @demo concat/concatMapTo.php
      * @operator
@@ -522,7 +479,7 @@ public function flatMap(callable $selector): Observable
      */
     public function flatMapTo(ObservableInterface $observable): Observable
     {
-        return $this->flatMap(function () use ($observable) {
+        return $this->flatMap(function () use ($observable): \Rx\ObservableInterface {
             return $observable;
         });
     }
@@ -531,12 +488,11 @@ public function flatMapTo(ObservableInterface $observable): Observable
      * Alias for flatMap
      *
      * @param $selector
-     * @return Observable
      *
      * @operator
      * @reactivex flatMap
      */
-    public function selectMany($selector): Observable
+    public function selectMany(callable $selector): Observable
     {
         return $this->flatMap($selector);
     }
@@ -567,8 +523,6 @@ public function flatMapLatest(callable $selector): Observable
     }
 
     /**
-     * @param integer $count
-     * @return Observable
      *
      * @demo skip/skip.php
      * @operator
@@ -576,7 +530,7 @@ public function flatMapLatest(callable $selector): Observable
      */
     public function skip(int $count): Observable
     {
-        return $this->lift(function () use ($count) {
+        return $this->lift(function () use ($count): \Rx\Operator\SkipOperator {
             return new SkipOperator($count);
         });
     }
@@ -596,7 +550,7 @@ public function skip(int $count): Observable
      */
     public function skipWhile(callable $predicate): Observable
     {
-        return $this->lift(function () use ($predicate) {
+        return $this->lift(function () use ($predicate): \Rx\Operator\SkipWhileOperator {
             return new SkipWhileOperator($predicate);
         });
     }
@@ -626,8 +580,6 @@ public function skipWhileWithIndex(callable $predicate): Observable
     /**
      * Returns a specified number of contiguous elements from the start of an observable sequence
      *
-     * @param integer $count
-     * @return Observable|EmptyObservable
      *
      * @demo take/take.php
      * @operator
@@ -639,7 +591,7 @@ public function take(int $count): Observable
             return self::empty();
         }
 
-        return $this->lift(function () use ($count) {
+        return $this->lift(function () use ($count): \Rx\Operator\TakeOperator {
             return new TakeOperator($count);
         });
     }
@@ -658,7 +610,7 @@ public function take(int $count): Observable
      */
     public function takeUntil(ObservableInterface $other): Observable
     {
-        return $this->lift(function () use ($other) {
+        return $this->lift(function () use ($other): \Rx\Operator\TakeUntilOperator {
             return new TakeUntilOperator($other);
         });
     }
@@ -668,8 +620,6 @@ public function takeUntil(ObservableInterface $other): Observable
      * a callback to test each source element for a condition.  The callback predicate is called with the value of the
      * element.
      *
-     * @param callable $predicate
-     * @return Observable
      *
      * @demo take/takeWhile.php
      * @operator
@@ -677,7 +627,7 @@ public function takeUntil(ObservableInterface $other): Observable
      */
     public function takeWhile(callable $predicate, bool $inclusive = false): Observable
     {
-        return $this->lift(function () use ($predicate, $inclusive) {
+        return $this->lift(function () use ($predicate, $inclusive): \Rx\Operator\TakeWhileOperator {
             return new TakeWhileOperator($predicate, $inclusive);
         });
     }
@@ -687,8 +637,6 @@ public function takeWhile(callable $predicate, bool $inclusive = false): Observa
      * a callback to test each source element for a condition.  The callback predicate is called with the index and the
      * value of the element.
      *
-     * @param callable $predicate
-     * @return Observable
      *
      * @demo take/takeWhileWithIndex.php
      * @operator
@@ -706,7 +654,6 @@ public function takeWhileWithIndex(callable $predicate): Observable
      * Returns a specified number of contiguous elements from the end of an observable sequence.
      *
      * @param $count
-     * @return Observable
      *
      * @demo take/takeLast.php
      * @operator
@@ -714,7 +661,7 @@ public function takeWhileWithIndex(callable $predicate): Observable
      */
     public function takeLast(int $count): Observable
     {
-        return $this->lift(function () use ($count) {
+        return $this->lift(function () use ($count): \Rx\Operator\TakeLastOperator {
             return new TakeLastOperator($count);
         });
     }
@@ -722,10 +669,8 @@ public function takeLast(int $count): Observable
     /**
      * Groups the elements of an observable sequence according to a specified key selector function and comparer and selects the resulting elements by using a specified function.
      *
-     * @param callable $keySelector
      * @param callable|null $elementSelector
      * @param callable|null $keySerializer
-     * @return Observable
      *
      * @demo groupBy/groupBy.php
      * @operator
@@ -733,7 +678,7 @@ public function takeLast(int $count): Observable
      */
     public function groupBy(callable $keySelector, callable $elementSelector = null, callable $keySerializer = null): Observable
     {
-        return $this->groupByUntil($keySelector, $elementSelector, function () {
+        return $this->groupByUntil($keySelector, $elementSelector, function (): \Rx\Observable\NeverObservable {
             return static::never();
         }, $keySerializer);
     }
@@ -741,11 +686,9 @@ public function groupBy(callable $keySelector, callable $elementSelector = null,
     /**
      * Groups the elements of an observable sequence according to a specified key selector function and comparer and selects the resulting elements by using a specified function.
      *
-     * @param callable $keySelector
      * @param callable|null $elementSelector
      * @param callable|null $durationSelector
      * @param callable|null $keySerializer
-     * @return Observable
      *
      * @demo groupBy/groupByUntil.php
      * @operator
@@ -753,7 +696,7 @@ public function groupBy(callable $keySelector, callable $elementSelector = null,
      */
     public function groupByUntil(callable $keySelector, callable $elementSelector = null, callable $durationSelector = null, callable $keySerializer = null): Observable
     {
-        return $this->lift(function () use ($keySelector, $elementSelector, $durationSelector, $keySerializer) {
+        return $this->lift(function () use ($keySelector, $elementSelector, $durationSelector, $keySerializer): \Rx\Operator\GroupByUntilOperator {
             return new GroupByUntilOperator($keySelector, $elementSelector, $durationSelector, $keySerializer);
         });
     }
@@ -761,9 +704,6 @@ public function groupByUntil(callable $keySelector, callable $elementSelector =
     /**
      * Lifts a function to the current Observable and returns a new Observable that when subscribed to will pass
      * the values of the current Observable through the Operator function.
-     *
-     * @param callable $operatorFactory
-     * @return Observable
      */
     public function lift(callable $operatorFactory): Observable
     {
@@ -782,7 +722,6 @@ public function lift(callable $operatorFactory): Observable
      *
      * @param $name
      * @param $arguments
-     * @return Observable
      *
      * @demo custom-operator/rot13.php
      */
@@ -796,7 +735,7 @@ public function __call($name, array $arguments): Observable
         }
         $className = $fullNamespace . ucfirst($name) . 'Operator';
 
-        return $this->lift(function () use ($className, $arguments) {
+        return $this->lift(function () use ($className, $arguments): object {
             return (new \ReflectionClass($className))->newInstanceArgs($arguments);
         });
     }
@@ -818,7 +757,7 @@ public function __call($name, array $arguments): Observable
      */
     public function reduce(callable $accumulator, $seed = null): Observable
     {
-        return $this->lift(function () use ($accumulator, $seed) {
+        return $this->lift(function () use ($accumulator, $seed): \Rx\Operator\ReduceOperator {
             return new ReduceOperator($accumulator, $seed);
         });
     }
@@ -829,7 +768,6 @@ public function reduce(callable $accumulator, $seed = null): Observable
      * structure which can grow large.
      *
      * @param callable|null $comparer
-     * @return Observable
      *
      * @demo distinct/distinct.php
      * @operator
@@ -837,7 +775,7 @@ public function reduce(callable $accumulator, $seed = null): Observable
      */
     public function distinct(callable $comparer = null): Observable
     {
-        return $this->lift(function () use ($comparer) {
+        return $this->lift(function () use ($comparer): \Rx\Operator\DistinctOperator {
             return new DistinctOperator(null, $comparer);
         });
     }
@@ -847,7 +785,6 @@ public function distinct(callable $comparer = null): Observable
      *
      * @param callable|null $keySelector
      * @param callable|null $comparer
-     * @return Observable
      *
      * @demo distinct/distinctKey.php
      * @operator
@@ -855,7 +792,7 @@ public function distinct(callable $comparer = null): Observable
      */
     public function distinctKey(callable $keySelector, callable $comparer = null): Observable
     {
-        return $this->lift(function () use ($keySelector, $comparer) {
+        return $this->lift(function () use ($keySelector, $comparer): \Rx\Operator\DistinctOperator {
             return new DistinctOperator($keySelector, $comparer);
         });
     }
@@ -863,8 +800,6 @@ public function distinctKey(callable $keySelector, callable $comparer = null): O
     /**
      * A variant of distinct that only compares emitted items from the source Observable against their immediate predecessors in order to determine whether or not they are distinct.
      *
-     * @param callable $comparer
-     * @return Observable
      *
      * @demo distinct/distinctUntilChanged.php
      * @operator
@@ -872,7 +807,7 @@ public function distinctKey(callable $keySelector, callable $comparer = null): O
      */
     public function distinctUntilChanged(callable $comparer = null): Observable
     {
-        return $this->lift(function () use ($comparer) {
+        return $this->lift(function () use ($comparer): \Rx\Operator\DistinctUntilChangedOperator {
             return new DistinctUntilChangedOperator(null, $comparer);
         });
     }
@@ -881,9 +816,6 @@ public function distinctUntilChanged(callable $comparer = null): Observable
      * Variant of distinctUntilChanged that takes a key selector
      * and the comparer.
      *
-     * @param callable $keySelector
-     * @param callable $comparer
-     * @return Observable
      *
      * @demo distinct/distinctUntilKeyChanged.php
      * @operator
@@ -891,7 +823,7 @@ public function distinctUntilChanged(callable $comparer = null): Observable
      */
     public function distinctUntilKeyChanged(callable $keySelector = null, callable $comparer = null): Observable
     {
-        return $this->lift(function () use ($keySelector, $comparer) {
+        return $this->lift(function () use ($keySelector, $comparer): \Rx\Operator\DistinctUntilChangedOperator {
             return new DistinctUntilChangedOperator($keySelector, $comparer);
         });
     }
@@ -911,11 +843,7 @@ public function distinctUntilKeyChanged(callable $keySelector = null, callable $
      * additional events.
      *
      * @param callable|ObserverInterface $onNextOrObserver
-     * @param callable $onError
-     * @param callable $onCompleted
-     * @return Observable
      * @throws \InvalidArgumentException
-     *
      * @demo do/do.php
      * @operator
      * @reactivex do
@@ -930,7 +858,7 @@ public function do($onNextOrObserver = null, callable $onError = null, callable
             throw new \InvalidArgumentException('The first argument needs to be a "callable" or "Observer"');
         }
 
-        return $this->lift(function () use ($observer) {
+        return $this->lift(function () use ($observer): \Rx\Operator\DoOnEachOperator {
             return new DoOnEachOperator($observer);
         });
     }
@@ -938,9 +866,6 @@ public function do($onNextOrObserver = null, callable $onError = null, callable
     /**
      * @deprecated Use `do`
      * Alias for do
-     *
-     * @param ObserverInterface $observer
-     * @return mixed
      */
     public function doOnEach(ObserverInterface $observer): Observable
     {
@@ -949,8 +874,6 @@ public function doOnEach(ObserverInterface $observer): Observable
 
     /**
      * @deprecated Use `do`
-     * @param callable $onNext
-     * @return Observable
      *
      * @demo do/doOnNext.php
      * @operator
@@ -964,8 +887,6 @@ public function doOnNext(callable $onNext): Observable
     }
 
     /**
-     * @param callable $onError
-     * @return Observable
      *
      * @demo do/doOnError.php
      * @operator
@@ -980,8 +901,6 @@ public function doOnError(callable $onError): Observable
     }
 
     /**
-     * @param callable $onCompleted
-     * @return Observable
      *
      * @demo do/doOnCompleted.php
      * @operator
@@ -1002,7 +921,6 @@ public function doOnCompleted(callable $onCompleted): Observable
      *
      * @param $accumulator
      * @param mixed $seed
-     * @return Observable
      *
      * @demo scan/scan.php
      * @demo scan/scan-with-seed.php
@@ -1011,7 +929,7 @@ public function doOnCompleted(callable $onCompleted): Observable
      */
     public function scan(callable $accumulator, $seed = null): Observable
     {
-        return $this->lift(function () use ($accumulator, $seed) {
+        return $this->lift(function () use ($accumulator, $seed): \Rx\Operator\ScanOperator {
             return new ScanOperator($accumulator, $seed);
         });
     }
@@ -1028,7 +946,7 @@ public function scan(callable $accumulator, $seed = null): Observable
      */
     public function toArray(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\ToArrayOperator {
             return new ToArrayOperator();
         });
     }
@@ -1050,7 +968,7 @@ public function toArray(): Observable
      */
     public function skipLast(int $count): Observable
     {
-        return $this->lift(function () use ($count) {
+        return $this->lift(function () use ($count): \Rx\Operator\SkipLastOperator {
             return new SkipLastOperator($count);
         });
     }
@@ -1068,7 +986,7 @@ public function skipLast(int $count): Observable
      */
     public function skipUntil(ObservableInterface $other): Observable
     {
-        return $this->lift(function () use ($other) {
+        return $this->lift(function () use ($other): \Rx\Operator\SkipUntilOperator {
             return new SkipUntilOperator($other);
         });
     }
@@ -1077,8 +995,6 @@ public function skipUntil(ObservableInterface $other): Observable
      * Returns an observable sequence that produces a value after dueTime has elapsed.
      *
      * @param integer $dueTime - milliseconds
-     * @param AsyncSchedulerInterface $scheduler
-     * @return TimerObservable
      *
      * @demo timer/timer.php
      * @operator
@@ -1100,7 +1016,7 @@ public static function timer(int $dueTime, AsyncSchedulerInterface $scheduler =
      */
     public function asObservable(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\AsObservableOperator {
             return new AsObservableOperator();
         });
     }
@@ -1108,8 +1024,6 @@ public function asObservable(): Observable
     /**
      * Concatenate an observable sequence onto the end of the source observable.
      *
-     * @param ObservableInterface $observable
-     * @return Observable
      *
      * @demo concat/concat.php
      * @operator
@@ -1117,7 +1031,7 @@ public function asObservable(): Observable
      */
     public function concat(ObservableInterface $observable): Observable
     {
-        return $this->lift(function () use ($observable) {
+        return $this->lift(function () use ($observable): \Rx\Operator\ConcatOperator {
             return new ConcatOperator($observable);
         });
     }
@@ -1149,7 +1063,7 @@ public function concat(ObservableInterface $observable): Observable
      */
     public function concatMap(callable $selector, callable $resultSelector = null): Observable
     {
-        return $this->lift(function () use ($selector, $resultSelector) {
+        return $this->lift(function () use ($selector, $resultSelector): ConcatMapOperator {
             return new ConcatMapOperator(new ObservableFactoryWrapper($selector), $resultSelector);
         });
     }
@@ -1178,7 +1092,7 @@ public function concatMap(callable $selector, callable $resultSelector = null):
      */
     public function concatMapTo(ObservableInterface $observable, callable $resultSelector = null): Observable
     {
-        return $this->concatMap(function () use ($observable) {
+        return $this->concatMap(function () use ($observable): \Rx\ObservableInterface {
             return $observable;
         }, $resultSelector);
     }
@@ -1194,7 +1108,7 @@ public function concatMapTo(ObservableInterface $observable, callable $resultSel
      */
     public function concatAll(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\ConcatAllOperator {
             return new ConcatAllOperator();
         });
     }
@@ -1203,8 +1117,6 @@ public function concatAll(): Observable
      * Returns an observable sequence containing a value that represents how many elements in the specified observable
      * sequence satisfy a condition if provided, else the count of items.
      *
-     * @param callable $predicate
-     * @return Observable
      *
      * @demo count/count.php
      * @operator
@@ -1212,7 +1124,7 @@ public function concatAll(): Observable
      */
     public function count(callable $predicate = null): Observable
     {
-        return $this->lift(function () use ($predicate) {
+        return $this->lift(function () use ($predicate): \Rx\Operator\CountOperator {
             return new CountOperator($predicate);
         });
     }
@@ -1223,9 +1135,7 @@ public function count(callable $predicate = null): Observable
      * exposing the sequence resulting from the selector function's invocation. For specializations with fixed subject
      * types, see Publish, PublishLast, and Replay.
      *
-     * @param \Rx\Subject\Subject $subject
      * @param callable|null $selector
-     * @return Observable
      *
      * @demo multicast/multicast.php
      * @operator
@@ -1234,7 +1144,7 @@ public function count(callable $predicate = null): Observable
     public function multicast(Subject $subject, callable $selector = null): Observable
     {
         return $selector ?
-            new MulticastObservable($this, function () use ($subject) {
+            new MulticastObservable($this, function () use ($subject): \Rx\Subject\Subject {
                 return $subject;
             }, $selector) :
             new ConnectableObservable($this, $subject);
@@ -1246,7 +1156,6 @@ public function multicast(Subject $subject, callable $selector = null): Observab
      * separate multicast invocation, exposing the sequence resulting from the selector function's invocation.
      * For specializations with fixed subject types, see Publish, PublishLast, and Replay.
      *
-     * @param callable $subjectSelector
      * @param callable|null $selector
      * @return \Rx\Observable\ConnectableObservable|\Rx\Observable\MulticastObservable
      *
@@ -1298,7 +1207,6 @@ public function publishLast(callable $selector = null): Observable
      * This operator is a specialization of Multicast using a BehaviorSubject.
      *
      * @param mixed $initialValue
-     * @param callable $selector
      * @return \Rx\Observable\ConnectableObservable|\Rx\Observable\MulticastObservable
      *
      * @demo publish/publishValue.php
@@ -1352,7 +1260,7 @@ public function singleInstance(): Observable
             if (!$hasObservable) {
                 $hasObservable = true;
                 $observable = $source
-                    ->finally(function () use (&$hasObservable) {
+                    ->finally(function () use (&$hasObservable): void {
                         $hasObservable = false;
                     })
                     ->publish()
@@ -1361,7 +1269,7 @@ public function singleInstance(): Observable
             return $observable;
         };
 
-        return new Observable\AnonymousObservable(function (ObserverInterface $o) use ($getObservable) {
+        return new Observable\AnonymousObservable(function (ObserverInterface $o) use ($getObservable): \Rx\DisposableInterface {
             return $getObservable()->subscribe($o);
         });
     }
@@ -1375,7 +1283,6 @@ public function singleInstance(): Observable
      * returns to zero, at which point the subscription is disposed.
      *
      * @param $initialValue
-     * @return \Rx\Observable\RefCountObservable
      *
      * @demo share/shareValue.php
      * @operator
@@ -1416,10 +1323,7 @@ public function replay(callable $selector = null, int $bufferSize = null, int $w
      * zero to one, then shares that  subscription with all subsequent observers until the number of observers returns
      * to zero, at which point the subscription is disposed.
      *
-     * @param integer $bufferSize
-     * @param integer $windowSize
      * @param $scheduler
-     * @return \Rx\Observable\RefCountObservable
      *
      * @demo share/shareReplay.php
      * @operator
@@ -1436,9 +1340,6 @@ public function shareReplay(int $bufferSize, int $windowSize = null, SchedulerIn
      * result selector function is omitted, a list with the elements of the observable sequences at corresponding
      * indexes will be yielded.
      *
-     * @param array $observables
-     * @param callable $selector
-     * @return Observable
      *
      * @demo zip/zip.php
      * @demo zip/zip-result-selector.php
@@ -1447,7 +1348,7 @@ public function shareReplay(int $bufferSize, int $windowSize = null, SchedulerIn
      */
     public function zip(array $observables, callable $selector = null): Observable
     {
-        return $this->lift(function () use ($observables, $selector) {
+        return $this->lift(function () use ($observables, $selector): \Rx\Operator\ZipOperator {
             return new ZipOperator($observables, $selector);
         });
     }
@@ -1455,9 +1356,7 @@ public function zip(array $observables, callable $selector = null): Observable
     /**
      * Runs all observable sequences in parallel and collect their last elements.
      *
-     * @param array $observables
      * @param callable|null $resultSelector
-     * @return ForkJoinObservable
      *
      * @demo forkJoin/forkJoin.php
      * @operator
@@ -1473,8 +1372,6 @@ public static function forkJoin(array $observables = [], callable $resultSelecto
      * If the retry count is not specified, it retries indefinitely. Note if you encounter an error and want it to
      * retry once, then you must use ->retry(2).
      *
-     * @param int $retryCount
-     * @return Observable
      *
      * @demo retry/retry.php
      * @operator
@@ -1482,7 +1379,7 @@ public static function forkJoin(array $observables = [], callable $resultSelecto
      */
     public function retry(int $retryCount = -1): Observable
     {
-        return $this->lift(function () use ($retryCount) {
+        return $this->lift(function () use ($retryCount): \Rx\Operator\RetryOperator {
             return new RetryOperator($retryCount);
         });
     }
@@ -1491,8 +1388,6 @@ public function retry(int $retryCount = -1): Observable
      * Repeats the source observable sequence on error when the notifier emits a next value. If the source observable
      * errors and the notifier completes, it will complete the source sequence.
      *
-     * @param callable $notifier
-     * @return Observable
      *
      * @demo retry/retryWhen.php
      * @operator
@@ -1500,7 +1395,7 @@ public function retry(int $retryCount = -1): Observable
      */
     public function retryWhen(callable $notifier): Observable
     {
-        return $this->lift(function () use ($notifier) {
+        return $this->lift(function () use ($notifier): \Rx\Operator\RetryWhenOperator {
             return new RetryWhenOperator(new ObservableFactoryWrapper($notifier));
         });
     }
@@ -1510,9 +1405,7 @@ public function retryWhen(callable $notifier): Observable
      * any of the observable sequences produces an element. Observables need to be an array.
      * If the result selector is omitted, a list with the elements will be yielded.
      *
-     * @param array $observables
      * @param callable|null $selector
-     * @return Observable
      *
      * @demo combineLatest/combineLatest.php
      * @operator
@@ -1520,7 +1413,7 @@ public function retryWhen(callable $notifier): Observable
      */
     public function combineLatest(array $observables, callable $selector = null): Observable
     {
-        return $this->lift(function () use ($observables, $selector) {
+        return $this->lift(function () use ($observables, $selector): \Rx\Operator\CombineLatestOperator {
             return new CombineLatestOperator($observables, $selector);
         });
     }
@@ -1528,7 +1421,6 @@ public function combineLatest(array $observables, callable $selector = null): Ob
     /**
      * Merges the specified observable sequences into one observable sequence by using the selector function only when the (first) source observable sequence produces an element.
      *
-     * @param array $observables
      * @param callable|null $selector
      * @return Observable - An observable sequence containing the result of combining elements of the sources using the specified result selector function.
      *
@@ -1538,7 +1430,7 @@ public function combineLatest(array $observables, callable $selector = null): Ob
      */
     public function withLatestFrom(array $observables, callable $selector = null): Observable
     {
-        return $this->lift(function () use ($observables, $selector) {
+        return $this->lift(function () use ($observables, $selector): \Rx\Operator\WithLatestFromOperator {
             return new WithLatestFromOperator($observables, $selector);
         });
     }
@@ -1546,8 +1438,6 @@ public function withLatestFrom(array $observables, callable $selector = null): O
     /**
      * Returns the specified value of an observable if the sequence is empty.
      *
-     * @param ObservableInterface $observable
-     * @return Observable
      *
      * @demo defaultIfEmpty/defaultIfEmpty.php
      * @operator
@@ -1555,7 +1445,7 @@ public function withLatestFrom(array $observables, callable $selector = null): O
      */
     public function defaultIfEmpty(ObservableInterface $observable): Observable
     {
-        return $this->lift(function () use ($observable) {
+        return $this->lift(function () use ($observable): \Rx\Operator\DefaultIfEmptyOperator {
             return new DefaultIfEmptyOperator($observable);
         });
     }
@@ -1563,8 +1453,6 @@ public function defaultIfEmpty(ObservableInterface $observable): Observable
     /**
      * Generates an observable sequence that repeats the given element the specified number of times.
      *
-     * @param int $count
-     * @return Observable|EmptyObservable
      *
      * @demo repeat/repeat.php
      * @operator
@@ -1576,7 +1464,7 @@ public function repeat(int $count = -1): Observable
             return self::empty();
         }
 
-        return $this->lift(function () use ($count) {
+        return $this->lift(function () use ($count): \Rx\Operator\RepeatOperator {
             return new RepeatOperator($count);
         });
     }
@@ -1588,8 +1476,6 @@ public function repeat(int $count = -1): Observable
      * repeatWhen will call onCompleted or onError on the child subscription. Otherwise, this Observable will
      * resubscribe to the source observable.
      *
-     * @param callable $notifier
-     * @return Observable
      *
      * @demo repeat/repeatWhen.php
      * @operator
@@ -1597,20 +1483,17 @@ public function repeat(int $count = -1): Observable
      */
     public function repeatWhen(callable $notifier): Observable
     {
-        return $this->lift(function () use ($notifier) {
+        return $this->lift(function () use ($notifier): \Rx\Operator\RepeatWhenOperator {
             return new RepeatWhenOperator(new ObservableFactoryWrapper($notifier));
         });
     }
 
     /**
      * Wraps the source sequence in order to run its subscription and unsubscription logic on the specified scheduler.
-     *
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      */
     public function subscribeOn(SchedulerInterface $scheduler): Observable
     {
-        return $this->lift(function () use ($scheduler) {
+        return $this->lift(function () use ($scheduler): \Rx\Operator\SubscribeOnOperator {
             return new SubscribeOnOperator($scheduler);
         });
     }
@@ -1620,7 +1503,6 @@ public function subscribeOn(SchedulerInterface $scheduler): Observable
      *
      * @param $delay
      * @param AsyncSchedulerInterface|null $scheduler
-     * @return Observable
      *
      * @demo delay/delay.php
      * @operator
@@ -1628,7 +1510,7 @@ public function subscribeOn(SchedulerInterface $scheduler): Observable
      */
     public function delay(int $delay, AsyncSchedulerInterface $scheduler = null): Observable
     {
-        return $this->lift(function () use ($delay, $scheduler) {
+        return $this->lift(function () use ($delay, $scheduler): \Rx\Operator\DelayOperator {
             return new DelayOperator($delay, $scheduler ?: Scheduler::getAsync());
         });
     }
@@ -1638,9 +1520,6 @@ public function delay(int $delay, AsyncSchedulerInterface $scheduler = null): Ob
      * When a timeout occurs, this operator errors with an instance of Rx\Exception\TimeoutException
      *
      * @param $timeout
-     * @param ObservableInterface $timeoutObservable
-     * @param AsyncSchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo timeout/timeout.php
      * @operator
@@ -1648,8 +1527,8 @@ public function delay(int $delay, AsyncSchedulerInterface $scheduler = null): Ob
      */
     public function timeout(int $timeout, ObservableInterface $timeoutObservable = null, AsyncSchedulerInterface $scheduler = null): Observable
     {
-        return $this->lift(function () use ($timeout, $timeoutObservable, $scheduler) {
-            return new TimeoutOperator($timeout, $timeoutObservable, $scheduler ?: Scheduler::getAsync());
+        return $this->lift(function () use ($timeout, $timeoutObservable, $scheduler): \Rx\Operator\TimeoutOperator {
+            return new TimeoutOperator($timeout, $scheduler ?: Scheduler::getAsync(), $timeoutObservable);
         });
     }
 
@@ -1658,8 +1537,6 @@ public function timeout(int $timeout, ObservableInterface $timeoutObservable = n
      * element count information.
      *
      * @param $count
-     * @param int $skip
-     * @return Observable
      * @throws \InvalidArgumentException
      *
      * @demo bufferWithCount/bufferWithCount.php
@@ -1669,7 +1546,7 @@ public function timeout(int $timeout, ObservableInterface $timeoutObservable = n
      */
     public function bufferWithCount(int $count, int $skip = null): Observable
     {
-        return $this->lift(function () use ($count, $skip) {
+        return $this->lift(function () use ($count, $skip): \Rx\Operator\BufferWithCountOperator {
             return new BufferWithCountOperator($count, $skip);
         });
     }
@@ -1677,8 +1554,6 @@ public function bufferWithCount(int $count, int $skip = null): Observable
     /**
      * Continues an observable sequence that is terminated by an exception with the next observable sequence.
      *
-     * @param callable $selector
-     * @return Observable
      *
      * @demo catch/catch.php
      * @operator
@@ -1686,7 +1561,7 @@ public function bufferWithCount(int $count, int $skip = null): Observable
      */
     public function catch(callable $selector): Observable
     {
-        return $this->lift(function () use ($selector) {
+        return $this->lift(function () use ($selector): \Rx\Operator\CatchErrorOperator {
             return new CatchErrorOperator(new ObservableFactoryWrapper($selector));
         });
     }
@@ -1694,9 +1569,6 @@ public function catch(callable $selector): Observable
     /**
      * @deprecated Use `catch`
      * Alias for catch
-     *
-     * @param callable $selector
-     * @return Observable
      */
     public function catchError(callable $selector): Observable
     {
@@ -1707,8 +1579,6 @@ public function catchError(callable $selector): Observable
      * Prepends a value to an observable sequence with an argument of a signal value to prepend.
      *
      * @param mixed $startValue
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo startWith/startWith.php
      * @operator
@@ -1722,9 +1592,6 @@ public function startWith($startValue, SchedulerInterface $scheduler = null): Ob
     /**
      * Prepends a sequence of values to an observable sequence with an argument of an array of values to prepend.
      *
-     * @param array $startArray
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo startWith/startWithArray.php
      * @operator
@@ -1732,7 +1599,7 @@ public function startWith($startValue, SchedulerInterface $scheduler = null): Ob
      */
     public function startWithArray(array $startArray, SchedulerInterface $scheduler = null): Observable
     {
-        return $this->lift(function () use ($startArray, $scheduler) {
+        return $this->lift(function () use ($startArray, $scheduler): \Rx\Operator\StartWithArrayOperator {
             return new StartWithArrayOperator($startArray, $scheduler ?: Scheduler::getDefault());
         });
     }
@@ -1740,8 +1607,6 @@ public function startWithArray(array $startArray, SchedulerInterface $scheduler
     /**
      * Returns the minimum value in an observable sequence according to the specified comparer.
      *
-     * @param callable $comparer
-     * @return Observable
      *
      * @demo min/min.php
      * @demo min/min-with-comparer.php
@@ -1750,7 +1615,7 @@ public function startWithArray(array $startArray, SchedulerInterface $scheduler
      */
     public function min(callable $comparer = null): Observable
     {
-        return $this->lift(function () use ($comparer) {
+        return $this->lift(function () use ($comparer): \Rx\Operator\MinOperator {
             return new MinOperator($comparer);
         });
     }
@@ -1758,8 +1623,6 @@ public function min(callable $comparer = null): Observable
     /**
      * Returns the maximum value in an observable sequence according to the specified comparer.
      *
-     * @param callable $comparer
-     * @return Observable
      *
      * @demo max/max.php
      * @demo max/max-with-comparer.php
@@ -1768,7 +1631,7 @@ public function min(callable $comparer = null): Observable
      */
     public function max(callable $comparer = null): Observable
     {
-        return $this->lift(function () use ($comparer) {
+        return $this->lift(function () use ($comparer): \Rx\Operator\MaxOperator {
             return new MaxOperator($comparer);
         });
     }
@@ -1776,14 +1639,13 @@ public function max(callable $comparer = null): Observable
     /**
      * Materializes the implicit notifications of an observable sequence as explicit notifications.
      *
-     * @return Observable
      *
      * @operator
      * @reactivex materialize-dematerialize
      */
     public function materialize(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\MaterializeOperator {
             return new MaterializeOperator();
         });
     }
@@ -1791,14 +1653,13 @@ public function materialize(): Observable
     /**
      * Dematerializes the explicit notification values of an observable sequence as implicit notifications.
      *
-     * @return Observable
      *
      * @operator
      * @reactivex materialize-dematerialize
      */
     public function dematerialize(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\DematerializeOperator {
             return new DematerializeOperator();
         });
     }
@@ -1807,7 +1668,6 @@ public function dematerialize(): Observable
      * Records the timestamp for each value in an observable sequence.
      *
      * @param SchedulerInterface|null $scheduler
-     * @return Observable
      *
      * @demo timestamp/timestamp.php
      * @operator
@@ -1815,7 +1675,7 @@ public function dematerialize(): Observable
      */
     public function timestamp(SchedulerInterface $scheduler = null): Observable
     {
-        return $this->lift(function () use ($scheduler) {
+        return $this->lift(function () use ($scheduler): \Rx\Operator\TimestampOperator {
             return new TimestampOperator($scheduler ?: Scheduler::getDefault());
         });
     }
@@ -1833,7 +1693,7 @@ public function timestamp(SchedulerInterface $scheduler = null): Observable
      */
     public function switch(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\SwitchLatestOperator {
             return new SwitchLatestOperator();
         });
     }
@@ -1841,8 +1701,6 @@ public function switch(): Observable
     /**
      * @deprecated Use `switch`
      * Alias for switch
-     *
-     * @return Observable
      */
     public function switchLatest(): Observable
     {
@@ -1866,7 +1724,7 @@ public function switchLatest(): Observable
      */
     public function switchFirst(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\SwitchFirstOperator {
             return new SwitchFirstOperator();
         });
     }
@@ -1879,7 +1737,6 @@ public function switchFirst(): Observable
      * Both also propagate all error observations arising from the source and each completes
      * when the source completes.
      *
-     * @param callable $predicate
      * @return Observable[]
      *
      * @demo partition/partition.php
@@ -1890,7 +1747,7 @@ public function partition(callable $predicate): array
     {
         return [
             $this->filter($predicate),
-            $this->filter(function () use ($predicate) {
+            $this->filter(function () use ($predicate): bool {
                 return !call_user_func_array($predicate, func_get_args());
             })
         ];
@@ -1900,8 +1757,6 @@ public function partition(callable $predicate): array
      * Propagates the observable sequence that reacts first.  Also known as 'amb'.
      *
      * @param Observable[] $observables
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo race/race.php
      * @operator
@@ -1913,7 +1768,7 @@ public static function race(array $observables, SchedulerInterface $scheduler =
             return $observables[0];
         }
 
-        return static::fromArray($observables, $scheduler)->lift(function () {
+        return static::fromArray($observables, $scheduler)->lift(function (): \Rx\Operator\RaceOperator {
             return new RaceOperator();
         });
     }
@@ -1921,7 +1776,6 @@ public static function race(array $observables, SchedulerInterface $scheduler =
     /**
      * Computes the sum of a sequence of values
      *
-     * @return Observable
      *
      * @demo sum/sum.php
      * @operator
@@ -1930,7 +1784,7 @@ public static function race(array $observables, SchedulerInterface $scheduler =
     public function sum(): Observable
     {
         return $this
-            ->reduce(function ($a, $x) {
+            ->reduce(function ($a, $x): float|int|array {
                 return $a + $x;
             }, 0);
     }
@@ -1938,7 +1792,6 @@ public function sum(): Observable
     /**
      * Computes the average of an observable sequence of values.
      *
-     * @return Observable
      *
      * @demo average/average.php
      * @operator
@@ -1948,7 +1801,7 @@ public function average(): Observable
     {
         return $this
             ->defaultIfEmpty(Observable::error(new \UnderflowException()))
-            ->reduce(function ($a, $x) {
+            ->reduce(function ($a, $x): float|int {
                 static $count = 0;
                 static $total = 0;
 
@@ -1964,7 +1817,6 @@ public function average(): Observable
      * all elements in the Observable sequence. If a property can't be resolved the observable will error.
      *
      * @param mixed $property
-     * @return Observable
      *
      * @demo pluck/pluck.php
      * @operator
@@ -1997,8 +1849,6 @@ public function pluck($property): Observable
      * the last item emitted on the source observable will be emitted.
      *
      * @param $throttleDuration
-     * @param SchedulerInterface $scheduler
-     * @return Observable
      *
      * @demo throttle/throttle.php
      * @operator
@@ -2006,7 +1856,7 @@ public function pluck($property): Observable
      */
     public function throttle(int $throttleDuration, SchedulerInterface $scheduler = null): Observable
     {
-        return $this->lift(function () use ($throttleDuration, $scheduler) {
+        return $this->lift(function () use ($throttleDuration, $scheduler): \Rx\Operator\ThrottleOperator {
             return new ThrottleOperator($throttleDuration, $scheduler ?: Scheduler::getDefault());
         });
     }
@@ -2014,7 +1864,6 @@ public function throttle(int $throttleDuration, SchedulerInterface $scheduler =
     /**
      * If the source Observable is empty it returns an Observable that emits true, otherwise it emits false.
      *
-     * @return Observable
      *
      * @demo isEmpty/isEmpty.php
      * @demo isEmpty/isEmpty-false.php
@@ -2023,7 +1872,7 @@ public function throttle(int $throttleDuration, SchedulerInterface $scheduler =
      */
     public function isEmpty(): Observable
     {
-        return $this->lift(function () {
+        return $this->lift(function (): \Rx\Operator\IsEmptyOperator {
             return new IsEmptyOperator();
         });
     }
@@ -2031,8 +1880,6 @@ public function isEmpty(): Observable
     /**
      * Will call a specified function when the source terminates on complete or error.
      *
-     * @param callable $callback
-     * @return Observable
      *
      * @demo finally/finally.php
      * @demo finally/finally-error.php
@@ -2041,7 +1888,7 @@ public function isEmpty(): Observable
      */
     public function finally(callable $callback): Observable
     {
-        return $this->lift(function () use ($callback) {
+        return $this->lift(function () use ($callback): \Rx\Operator\FinallyOperator {
             return new FinallyOperator($callback);
         });
     }
@@ -2049,8 +1896,6 @@ public function finally(callable $callback): Observable
     /**
      * Converts a promise into an observable
      *
-     * @param PromiseInterface $promise
-     * @return Observable
      * @throws \InvalidArgumentException
      *
      * @demo promise/fromPromise.php
@@ -2065,8 +1910,6 @@ public static function fromPromise(PromiseInterface $promise): Observable
     /**
      * Converts Observable into a Promise
      *
-     * @param Deferred $deferred
-     * @return PromiseInterface
      * @throws \InvalidArgumentException
      */
     public function toPromise(Deferred $deferred = null): PromiseInterface
@@ -2078,7 +1921,6 @@ public function toPromise(Deferred $deferred = null): PromiseInterface
      * Will apply given function to the source observable.
      *
      * @param callable $compose function that applies operators to source observable. Must return observable.
-     * @return Observable
      *
      * @demo compose/compose.php
      */
diff --git a/src/Observable/AnonymousObservable.php b/src/Observable/AnonymousObservable.php
index edcfd693..bd6f701a 100644
--- a/src/Observable/AnonymousObservable.php
+++ b/src/Observable/AnonymousObservable.php
@@ -12,11 +12,8 @@
 
 class AnonymousObservable extends Observable
 {
-    private $subscribeAction;
-
-    public function __construct(callable $subscribeAction)
+    public function __construct(private $subscribeAction)
     {
-        $this->subscribeAction = $subscribeAction;
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -27,7 +24,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
 
         $autoDetachObserver->setDisposable($subscribeAction($autoDetachObserver));
 
-        return new CallbackDisposable(function () use ($autoDetachObserver) {
+        return new CallbackDisposable(function () use ($autoDetachObserver): void {
             $autoDetachObserver->dispose();
         });
     }
diff --git a/src/Observable/ArrayObservable.php b/src/Observable/ArrayObservable.php
index 7b1be03e..bdf16fce 100644
--- a/src/Observable/ArrayObservable.php
+++ b/src/Observable/ArrayObservable.php
@@ -11,14 +11,10 @@
 
 class ArrayObservable extends Observable
 {
-    private $data;
-
-    private $scheduler;
-
-    public function __construct(array $data, SchedulerInterface $scheduler)
-    {
-        $this->data      = $data;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private array $data,
+        private SchedulerInterface $scheduler
+    ){
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -28,14 +24,12 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
         $keys   = array_keys($values);
         $count  = 0;
 
-        return $this->scheduler->scheduleRecursive(function ($reschedule) use (&$observer, &$values, $max, &$count, $keys) {
+        return $this->scheduler->scheduleRecursive(function ($reschedule) use (&$observer, &$values, $max, &$count, $keys): void {
             if ($count < $max) {
                 $observer->onNext($values[$keys[$count]]);
                 $count++;
-                if ($count >= 1) {
-                    $reschedule();
-                    return;
-                }
+                $reschedule();
+                return;
             }
             $observer->onCompleted();
         });
diff --git a/src/Observable/ConnectableObservable.php b/src/Observable/ConnectableObservable.php
index 377fc32f..fdd2e7d9 100644
--- a/src/Observable/ConnectableObservable.php
+++ b/src/Observable/ConnectableObservable.php
@@ -11,34 +11,22 @@
 use Rx\ObserverInterface;
 use Rx\Subject\Subject;
 
-/**
- * Class ConnectableObservable
- * @package Rx\Observable
- */
 class ConnectableObservable extends Observable
 {
-    /** @var \Rx\Subject\Subject */
-    protected $subject;
+    protected Subject $subject;
 
-    /** @var  BinaryDisposable */
-    protected $subscription;
+    protected BinaryDisposable $subscription;
 
-    /** @var  Observable */
-    protected $sourceObservable;
+    protected Observable $sourceObservable;
 
-    /** @var bool */
-    protected $hasSubscription;
+    protected bool $hasSubscription = false;
 
-    /**
-     * ConnectableObservable constructor.
-     * @param Observable $source
-     * @param \Rx\Subject\Subject $subject
-     */
-    public function __construct(Observable $source, Subject $subject = null)
-    {
+    public function __construct(
+        Observable $source,
+        Subject $subject = null
+    ) {
         $this->sourceObservable = $source->asObservable();
         $this->subject          = $subject ?: new Subject();
-        $this->hasSubscription  = false;
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -54,7 +42,7 @@ public function connect(): DisposableInterface
 
         $this->hasSubscription = true;
 
-        $connectableDisposable = new CallbackDisposable(function () {
+        $connectableDisposable = new CallbackDisposable(function (): void {
             $this->hasSubscription = false;
         });
 
diff --git a/src/Observable/EmptyObservable.php b/src/Observable/EmptyObservable.php
index 57b4b3b6..6404db5b 100644
--- a/src/Observable/EmptyObservable.php
+++ b/src/Observable/EmptyObservable.php
@@ -11,16 +11,13 @@
 
 class EmptyObservable extends Observable
 {
-    private $scheduler;
-
-    public function __construct(SchedulerInterface $scheduler)
+    public function __construct(private readonly SchedulerInterface $scheduler)
     {
-        $this->scheduler = $scheduler;
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
     {
-        return $this->scheduler->schedule(function () use ($observer) {
+        return $this->scheduler->schedule(function () use ($observer): void {
             $observer->onCompleted();
         });
     }
diff --git a/src/Observable/ErrorObservable.php b/src/Observable/ErrorObservable.php
index 53a95d58..e4097160 100644
--- a/src/Observable/ErrorObservable.php
+++ b/src/Observable/ErrorObservable.php
@@ -11,18 +11,16 @@
 
 class ErrorObservable extends Observable
 {
-    private $error;
-    private $scheduler;
 
-    public function __construct(\Throwable $error, SchedulerInterface $scheduler)
-    {
-        $this->error     = $error;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private readonly \Throwable $error,
+        private readonly SchedulerInterface $scheduler
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
     {
-        return $this->scheduler->schedule(function () use ($observer) {
+        return $this->scheduler->schedule(function () use ($observer): void {
             $observer->onError($this->error);
         });
     }
diff --git a/src/Observable/ForkJoinObservable.php b/src/Observable/ForkJoinObservable.php
index d7f35221..cd6ee833 100644
--- a/src/Observable/ForkJoinObservable.php
+++ b/src/Observable/ForkJoinObservable.php
@@ -12,21 +12,12 @@
 
 class ForkJoinObservable extends Observable
 {
-    /**
-     * @var Observable[]
-     */
-    private $observables;
-
-    private $values = [];
-
-    private $completed = 0;
-
-    private $resultSelector;
-
-    public function __construct(array $observables = [], callable $resultSelector = null)
-    {
-        $this->observables    = $observables;
-        $this->resultSelector = $resultSelector;
+    public function __construct(
+        private readonly array         $observables = [],
+        private readonly null|\Closure $resultSelector = null,
+        private array                  $values = [],
+        private int                    $completed = 0
+    ) {
     }
 
     public function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -43,11 +34,11 @@ public function _subscribe(ObserverInterface $observer): DisposableInterface
 
         foreach ($this->observables as $i => $observable) {
             $innerDisp = $observable->subscribe(
-                function ($v) use ($i) {
+                function ($v) use ($i): void {
                     $this->values[$i] = $v;
                 },
-                [$autoObs, 'onError'],
-                function () use ($len, $i, $autoObs) {
+                fn ($e) => $autoObs->onError($e),
+                function () use ($len, $i, $autoObs): void {
                     $this->completed++;
 
                     if (!array_key_exists($i, $this->values)) {
diff --git a/src/Observable/GroupedObservable.php b/src/Observable/GroupedObservable.php
index 36ba1d33..660db258 100644
--- a/src/Observable/GroupedObservable.php
+++ b/src/Observable/GroupedObservable.php
@@ -13,16 +13,18 @@
 
 class GroupedObservable extends Observable
 {
-    private $key;
-    private $underlyingObservable;
+    private ObservableInterface $underlyingObservable;
 
-    public function __construct($key, ObservableInterface $underlyingObservable, RefCountDisposable $mergedDisposable = null)
-    {
+    public function __construct(
+        private $key,
+        ObservableInterface $underlyingObservable,
+        RefCountDisposable $mergedDisposable = null
+    ) {
         $this->key = $key;
 
-        $this->underlyingObservable = !$mergedDisposable ?
-            $underlyingObservable :
-            $this->newUnderlyingObservable($mergedDisposable, $underlyingObservable);
+        $this->underlyingObservable = $mergedDisposable instanceof RefCountDisposable ?
+            $this->newUnderlyingObservable($mergedDisposable, $underlyingObservable) :
+            $underlyingObservable;
     }
 
     public function getKey()
@@ -38,7 +40,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
     private function newUnderlyingObservable(RefCountDisposable $mergedDisposable, ObservableInterface $underlyingObservable): Observable
     {
         return new AnonymousObservable(
-            function ($observer) use ($mergedDisposable, $underlyingObservable) {
+            function ($observer) use ($mergedDisposable, $underlyingObservable): \Rx\Disposable\BinaryDisposable {
                 return new BinaryDisposable($mergedDisposable->getDisposable(), $underlyingObservable->subscribe($observer));
             }
         );
diff --git a/src/Observable/IntervalObservable.php b/src/Observable/IntervalObservable.php
index 90845c1e..e98d40b7 100644
--- a/src/Observable/IntervalObservable.php
+++ b/src/Observable/IntervalObservable.php
@@ -11,20 +11,10 @@
 
 class IntervalObservable extends Observable
 {
-    private $interval;
-
-    /** @var AsyncSchedulerInterface */
-    private $scheduler;
-
-    /**
-     * IntervalObservable constructor.
-     * @param $interval
-     * @param AsyncSchedulerInterface $scheduler
-     */
-    public function __construct(int $interval, AsyncSchedulerInterface $scheduler)
-    {
-        $this->interval  = $interval;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private int $interval,
+        private AsyncSchedulerInterface $scheduler
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -32,7 +22,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
         $counter = 0;
 
         return $this->scheduler->schedulePeriodic(
-            function () use (&$counter, $observer) {
+            function () use (&$counter, $observer): void {
                 $observer->onNext($counter++);
             },
             $this->interval, // this is to match RxJS behavior which delays the first item by the interval
diff --git a/src/Observable/IteratorObservable.php b/src/Observable/IteratorObservable.php
index 3bfb3958..3278ee33 100644
--- a/src/Observable/IteratorObservable.php
+++ b/src/Observable/IteratorObservable.php
@@ -11,21 +11,17 @@
 
 class IteratorObservable extends Observable
 {
-    private $items;
-
-    private $scheduler;
-
-    public function __construct(\Iterator $items, SchedulerInterface $scheduler = null)
-    {
-        $this->items     = $items;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private readonly \Iterator $items,
+        private readonly null|SchedulerInterface $scheduler = null
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
     {
         $key = 0;
 
-        $action = function ($reschedule) use (&$observer, &$key) {
+        $action = function ($reschedule) use (&$observer, &$key): void {
             try {
                 if (null === $key || !$this->items->valid()) {
 
diff --git a/src/Observable/MulticastObservable.php b/src/Observable/MulticastObservable.php
index 027340ab..13bfb61c 100644
--- a/src/Observable/MulticastObservable.php
+++ b/src/Observable/MulticastObservable.php
@@ -9,32 +9,13 @@
 use Rx\Observable;
 use Rx\ObserverInterface;
 
-/**
- * Class MulticastObservable
- * @package Rx\Observable
- */
 class MulticastObservable extends Observable
 {
-    /** @var \Rx\Observable */
-    private $source;
-
-    /** @var  callable */
-    private $fn1;
-
-    /** @var  callable */
-    private $fn2;
-
-    /**
-     * MulticastObservable constructor.
-     * @param $source
-     * @param $fn1
-     * @param $fn2
-     */
-    public function __construct(Observable $source, callable $fn1, callable $fn2)
-    {
-        $this->source = $source;
-        $this->fn1    = $fn1;
-        $this->fn2    = $fn2;
+    public function __construct(
+        private readonly Observable $source,
+        private readonly \Closure   $fn1,
+        private readonly \Closure $fn2
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
diff --git a/src/Observable/RangeObservable.php b/src/Observable/RangeObservable.php
index 785033a0..27d0a3af 100644
--- a/src/Observable/RangeObservable.php
+++ b/src/Observable/RangeObservable.php
@@ -11,24 +11,19 @@
 
 class RangeObservable extends Observable
 {
-    private $start;
 
-    private $count;
-
-    private $scheduler;
-
-    public function __construct(int $start, int $count, SchedulerInterface $scheduler)
-    {
-        $this->start     = $start;
-        $this->count     = $count;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private readonly int       $start,
+        private readonly int       $count,
+        private readonly SchedulerInterface $scheduler
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
     {
         $i = 0;
 
-        return $this->scheduler->scheduleRecursive(function ($reschedule) use (&$observer, &$i) {
+        return $this->scheduler->scheduleRecursive(function ($reschedule) use (&$observer, &$i): void {
             if ($i < $this->count) {
                 $observer->onNext($this->start + $i);
                 $i++;
diff --git a/src/Observable/RefCountObservable.php b/src/Observable/RefCountObservable.php
index 970d055d..1cf7358c 100644
--- a/src/Observable/RefCountObservable.php
+++ b/src/Observable/RefCountObservable.php
@@ -10,25 +10,14 @@
 use Rx\Observable;
 use Rx\ObserverInterface;
 
-/**
- * Class RefCountObservable
- * @package Rx\Observable
- */
 class RefCountObservable extends Observable
 {
-    /** @var \Rx\Observable\ConnectableObservable */
-    protected $source;
 
-    /** @var int */
-    protected $count;
-
-    /** @var  BinaryDisposable */
-    protected $connectableSubscription;
-
-    public function __construct(ConnectableObservable $source)
-    {
-        $this->source = $source;
-        $this->count  = 0;
+    public function __construct(
+        private readonly ConnectableObservable $source,
+        protected int                          $count = 0,
+        protected                              $connectableSubscription = null
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -41,7 +30,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
             $this->connectableSubscription = $this->source->connect();
         }
 
-        return new CallbackDisposable(function () use ($subscription) {
+        return new CallbackDisposable(function () use ($subscription): void {
             $subscription->dispose();
 
             $this->count--;
diff --git a/src/Observable/ReturnObservable.php b/src/Observable/ReturnObservable.php
index c777e148..17cab0f1 100644
--- a/src/Observable/ReturnObservable.php
+++ b/src/Observable/ReturnObservable.php
@@ -12,24 +12,21 @@
 
 class ReturnObservable extends Observable
 {
-    private $value;
-    private $scheduler;
-
-    public function __construct($value, SchedulerInterface $scheduler)
-    {
-        $this->value     = $value;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private $value,
+        private SchedulerInterface $scheduler
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
     {
         $disposable = new CompositeDisposable();
 
-        $disposable->add($this->scheduler->schedule(function () use ($observer) {
+        $disposable->add($this->scheduler->schedule(function () use ($observer): void {
             $observer->onNext($this->value);
         }));
 
-        $disposable->add($this->scheduler->schedule(function () use ($observer) {
+        $disposable->add($this->scheduler->schedule(function () use ($observer): void {
             $observer->onCompleted();
         }));
 
diff --git a/src/Observable/TimerObservable.php b/src/Observable/TimerObservable.php
index 1402b7a0..42cf3b64 100644
--- a/src/Observable/TimerObservable.php
+++ b/src/Observable/TimerObservable.php
@@ -11,20 +11,17 @@
 
 class TimerObservable extends Observable
 {
-    private $dueTime;
 
-    private $scheduler;
-
-    public function __construct(int $dueTime, AsyncSchedulerInterface $scheduler)
-    {
-        $this->dueTime   = $dueTime;
-        $this->scheduler = $scheduler;
+    public function __construct(
+        private readonly int            $dueTime,
+        private readonly AsyncSchedulerInterface $scheduler
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
     {
         return $this->scheduler->schedule(
-            function () use ($observer) {
+            function () use ($observer): void {
                 $observer->onNext(0);
                 $observer->onCompleted();
             },
diff --git a/src/ObservableInterface.php b/src/ObservableInterface.php
index 754118f6..333a6738 100644
--- a/src/ObservableInterface.php
+++ b/src/ObservableInterface.php
@@ -10,7 +10,6 @@ interface ObservableInterface
      * @param callable|ObserverInterface|null $onNextOrObserver
      * @param callable|null $onError
      * @param callable|null $onCompleted
-     * @return DisposableInterface
      * @throws \InvalidArgumentException
      */
     public function subscribe($onNextOrObserver = null, callable  $onError = null, callable $onCompleted = null): DisposableInterface;
diff --git a/src/Observer/AbstractObserver.php b/src/Observer/AbstractObserver.php
index 016b866d..05a2dd93 100644
--- a/src/Observer/AbstractObserver.php
+++ b/src/Observer/AbstractObserver.php
@@ -8,9 +8,9 @@
 
 abstract class AbstractObserver implements ObserverInterface
 {
-    private $isStopped = false;
+    private bool $isStopped = false;
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         if ($this->isStopped) {
             return;
@@ -20,7 +20,7 @@ public function onCompleted()
         $this->completed();
     }
 
-    public function onError(\Throwable $error)
+    public function onError(\Throwable $error): void
     {
         if ($this->isStopped) {
             return;
@@ -30,7 +30,7 @@ public function onError(\Throwable $error)
         $this->error($error);
     }
 
-    public function onNext($value)
+    public function onNext($value): void
     {
         if ($this->isStopped) {
             return;
diff --git a/src/Observer/AutoDetachObserver.php b/src/Observer/AutoDetachObserver.php
index fd6a31c1..00f85af4 100644
--- a/src/Observer/AutoDetachObserver.php
+++ b/src/Observer/AutoDetachObserver.php
@@ -11,24 +11,21 @@
 
 class AutoDetachObserver extends AbstractObserver
 {
-    private $observer;
+    private SingleAssignmentDisposable $disposable;
 
-    private $disposable;
-
-    public function __construct(ObserverInterface $observer)
+    public function __construct(private readonly ObserverInterface $observer)
     {
-        $this->observer   = $observer;
         $this->disposable = new SingleAssignmentDisposable();
     }
 
-    public function setDisposable(DisposableInterface $disposable = null)
+    public function setDisposable(DisposableInterface $disposable = null): void
     {
         $disposable = $disposable ?: new EmptyDisposable();
 
         $this->disposable->setDisposable($disposable);
     }
 
-    protected function completed()
+    protected function completed(): void
     {
         try {
             $this->observer->onCompleted();
@@ -39,7 +36,7 @@ protected function completed()
         }
     }
 
-    protected function error(\Throwable $exception)
+    protected function error(\Throwable $exception): void
     {
         try {
             $this->observer->onError($exception);
@@ -50,7 +47,7 @@ protected function error(\Throwable $exception)
         }
     }
 
-    protected function next($value)
+    protected function next($value): void
     {
         try {
             $this->observer->onNext($value);
@@ -60,7 +57,7 @@ protected function next($value)
         }
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         $this->disposable->dispose();
     }
diff --git a/src/Observer/CallbackObserver.php b/src/Observer/CallbackObserver.php
index 2234c028..256294b3 100644
--- a/src/Observer/CallbackObserver.php
+++ b/src/Observer/CallbackObserver.php
@@ -6,41 +6,36 @@
 
 class CallbackObserver extends AbstractObserver
 {
-    /** @var callable|null */
-    private $onNext;
 
-    /** @var callable|null */
-    private $onError;
-
-    /** @var callable|null */
-    private $onCompleted;
-
-    public function __construct(callable $onNext = null, callable $onError = null, callable $onCompleted = null)
-    {
-        $default = function () {
+    public function __construct(
+        private $onNext = null,
+        private $onError = null,
+        private $onCompleted = null
+    ) {
+        $default = function (): void {
         };
 
         $this->onNext = $this->getOrDefault($onNext, $default);
 
-        $this->onError = $this->getOrDefault($onError, function ($e) {
+        $this->onError = $this->getOrDefault($onError, function ($e): void {
             throw $e;
         });
 
         $this->onCompleted = $this->getOrDefault($onCompleted, $default);
     }
 
-    protected function completed()
+    protected function completed(): void
     {
         // Cannot use $foo() here, see: https://bugs.php.net/bug.php?id=47160
         ($this->onCompleted)();
     }
 
-    protected function error(\Throwable $error)
+    protected function error(\Throwable $error): void
     {
         ($this->onError)($error);
     }
 
-    protected function next($value)
+    protected function next($value): void
     {
         ($this->onNext)($value);
     }
diff --git a/src/Observer/DoObserver.php b/src/Observer/DoObserver.php
index 04bfc094..2a67c400 100644
--- a/src/Observer/DoObserver.php
+++ b/src/Observer/DoObserver.php
@@ -8,40 +8,34 @@
 
 class DoObserver implements ObserverInterface
 {
-    /** @var callable|null */
-    private $onNext;
-
-    /** @var callable|null */
-    private $onError;
-
-    /** @var callable|null */
-    private $onCompleted;
-
-    public function __construct(callable $onNext = null, callable $onError = null, callable $onCompleted = null)
-    {
-        $default = function () {
+    public function __construct(
+        private null|\Closure $onNext = null,
+        private null|\Closure $onError = null,
+        private null|\Closure $onCompleted = null
+    ) {
+        $default = function (): void {
         };
 
         $this->onNext = $this->getOrDefault($onNext, $default);
 
-        $this->onError = $this->getOrDefault($onError, function ($e) {
+        $this->onError = $this->getOrDefault($onError, function ($e): void {
             throw $e;
         });
 
         $this->onCompleted = $this->getOrDefault($onCompleted, $default);
     }
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         ($this->onCompleted)();
     }
 
-    public function onError(\Throwable $error)
+    public function onError(\Throwable $error): void
     {
         ($this->onError)($error);
     }
 
-    public function onNext($value)
+    public function onNext($value): void
     {
         ($this->onNext)($value);
     }
diff --git a/src/Observer/ScheduledObserver.php b/src/Observer/ScheduledObserver.php
index a3dc7de2..b28bb51d 100644
--- a/src/Observer/ScheduledObserver.php
+++ b/src/Observer/ScheduledObserver.php
@@ -10,59 +10,45 @@
 
 final class ScheduledObserver extends AbstractObserver
 {
-    /** @var SchedulerInterface */
-    private $scheduler;
-
-    /** @var ObserverInterface */
-    private $observer;
-
-    /** @var bool */
-    private $isAcquired = false;
-
-    /** @var bool */
-    private $hasFaulted = false;
-
-    /** @var \Closure[] */
-    private $queue = [];
-
-    /** @var SerialDisposable */
-    private $disposable;
+    private SerialDisposable $disposable;
 
     /**
      * ScheduledObserver constructor.
-     * @param SchedulerInterface $scheduler
-     * @param ObserverInterface $observer
      */
-    public function __construct(SchedulerInterface $scheduler, ObserverInterface $observer)
-    {
-        $this->scheduler  = $scheduler;
-        $this->observer   = $observer;
+    public function __construct(
+        private SchedulerInterface $scheduler,
+        private ObserverInterface $observer,
+        private bool $isAcquired = false,
+        private bool $hasFaulted = false,
+        /** @var \Closure[] */
+        private array $queue = []
+    ) {
         $this->disposable = new SerialDisposable();
     }
 
 
-    protected function completed()
+    protected function completed(): void
     {
-        $this->queue[] = function () {
+        $this->queue[] = function (): void {
             $this->observer->onCompleted();
         };
     }
 
-    protected function next($value)
+    protected function next($value): void
     {
-        $this->queue[] = function () use ($value) {
+        $this->queue[] = function () use ($value): void {
             $this->observer->onNext($value);
         };
     }
 
-    protected function error(\Throwable $error)
+    protected function error(\Throwable $error): void
     {
-        $this->queue[] = function () use ($error) {
+        $this->queue[] = function () use ($error): void {
             $this->observer->onError($error);
         };
     }
 
-    public function ensureActive()
+    public function ensureActive(): void
     {
         $isOwner = false;
         if (!$this->hasFaulted && count($this->queue) > 0) {
@@ -76,7 +62,7 @@ public function ensureActive()
 
         $this->disposable->setDisposable(
             $this->scheduler->scheduleRecursive(
-                function ($recurse) {
+                function ($recurse): void {
                     $parent = $this;
                     if (count($parent->queue) > 0) {
                         $work = array_shift($parent->queue);
@@ -99,7 +85,7 @@ function ($recurse) {
         );
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         $this->disposable->dispose();
     }
diff --git a/src/Operator/BufferWithCountOperator.php b/src/Operator/BufferWithCountOperator.php
index b41dd826..ad205268 100644
--- a/src/Operator/BufferWithCountOperator.php
+++ b/src/Operator/BufferWithCountOperator.php
@@ -11,23 +11,11 @@
 
 final class BufferWithCountOperator implements OperatorInterface
 {
-    /** @var int */
-    private $count;
-
-    /** @var */
-    private $skip;
-
-    /** @var int */
-    private $index = 0;
-
-    /**
-     * BufferOperator constructor.
-     * @param int $count
-     * @param int $skip
-     * @throws \InvalidArgumentException
-     */
-    public function __construct(int $count, int $skip = null)
-    {
+    public function __construct(
+        private int $count,
+        private null|int $skip = null,
+        private int $index = 0
+    ) {
         if ($count < 1) {
             throw new \InvalidArgumentException('count must be greater than or equal to 1');
         }
@@ -49,7 +37,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $currentGroups = [];
 
         return $observable->subscribe(new CallbackObserver(
-            function ($x) use (&$currentGroups, $observer) {
+            function ($x) use (&$currentGroups, $observer): void {
                 if ($this->index % $this->skip === 0) {
                     $currentGroups[] = [];
                 }
@@ -63,10 +51,10 @@ function ($x) use (&$currentGroups, $observer) {
                     }
                 }
             },
-            function ($err) use ($observer) {
+            function ($err) use ($observer): void {
                 $observer->onError($err);
             },
-            function () use (&$currentGroups, $observer) {
+            function () use (&$currentGroups, $observer): void {
                 foreach ($currentGroups as &$group) {
                     $observer->onNext($group);
                 }
diff --git a/src/Operator/CatchErrorOperator.php b/src/Operator/CatchErrorOperator.php
index 77d95a33..68d6ccd2 100644
--- a/src/Operator/CatchErrorOperator.php
+++ b/src/Operator/CatchErrorOperator.php
@@ -28,7 +28,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $isDisposed = false;
         $disposable = new CompositeDisposable();
 
-        $onError = function (\Throwable $e) use (&$isDisposed, $observer, $observable, $disposable) {
+        $onError = function (\Throwable $e) use (&$isDisposed, $observer, $observable, $disposable): void {
 
             if ($isDisposed) {
                 return;
@@ -48,16 +48,16 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         };
 
         $callbackObserver = new CallbackObserver(
-            [$observer, 'onNext'],
+            fn ($x) => $observer->onNext($x),
             $onError,
-            [$observer, 'onCompleted']
+            fn () => $observer->onCompleted(),
         );
 
         $subscription = $observable->subscribe($callbackObserver);
 
         $disposable->add($subscription);
 
-        $disposable->add(new CallbackDisposable(function () use (&$isDisposed) {
+        $disposable->add(new CallbackDisposable(function () use (&$isDisposed): void {
             $isDisposed = true;
         }));
 
diff --git a/src/Operator/CombineLatestOperator.php b/src/Operator/CombineLatestOperator.php
index a53dce7d..9dff9d18 100644
--- a/src/Operator/CombineLatestOperator.php
+++ b/src/Operator/CombineLatestOperator.php
@@ -13,7 +13,7 @@
 final class CombineLatestOperator implements OperatorInterface
 {
     /** @var ObservableInterface[] */
-    private $observables;
+    private array $observables;
 
     /** @var callable */
     private $resultSelector;
@@ -21,7 +21,7 @@ final class CombineLatestOperator implements OperatorInterface
     public function __construct(array $observables, callable $resultSelector = null)
     {
         if (null === $resultSelector) {
-            $resultSelector = function () {
+            $resultSelector = function (): array {
                 return func_get_args();
             };
         }
@@ -53,7 +53,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
             $hasValue[$key] = false;
 
             $cbObserver = new CallbackObserver(
-                function ($value) use ($count, &$hasValue, $key, &$values, $observer, &$waitingForValues, &$waitingToComplete) {
+                function ($value) use ($count, &$hasValue, $key, &$values, $observer, &$waitingForValues, &$waitingToComplete): void {
 
                     // If an observable has completed before it has emitted, we need to complete right away
                     if ($waitingForValues > $waitingToComplete) {
@@ -76,8 +76,8 @@ function ($value) use ($count, &$hasValue, $key, &$values, $observer, &$waitingF
                         }
                     }
                 },
-                [$observer, 'onError'],
-                function () use (&$waitingToComplete, $observer) {
+                fn ($err) => $observer->onError($err),
+                function () use (&$waitingToComplete, $observer): void {
                     $waitingToComplete--;
                     if ($waitingToComplete === 0) {
                         $observer->onCompleted();
diff --git a/src/Operator/ConcatAllOperator.php b/src/Operator/ConcatAllOperator.php
index f749a02f..1c408634 100644
--- a/src/Operator/ConcatAllOperator.php
+++ b/src/Operator/ConcatAllOperator.php
@@ -14,38 +14,23 @@
 
 final class ConcatAllOperator implements OperatorInterface
 {
-    /** @var  array */
-    private $buffer;
-
-    /** @var CompositeDisposable */
-    private $disposable;
-
-    /** @var SerialDisposable */
-    private $innerDisposable;
-
-    /** @var bool */
-    private $startBuffering;
-
-    /** @var bool */
-    private $sourceCompleted;
-
-    /** @var bool */
-    private $innerCompleted;
+    private array $buffer = [];
+    private CompositeDisposable $disposable;
+    private DisposableInterface $innerDisposable;
+    private bool $startBuffering = false;
+    private bool $sourceCompleted = false;
+    private bool $innerCompleted = true;
 
     public function __construct()
     {
-        $this->buffer          = [];
         $this->disposable      = new CompositeDisposable();
         $this->innerDisposable = new EmptyDisposable();
-        $this->startBuffering  = false;
-        $this->sourceCompleted = false;
-        $this->innerCompleted  = true;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $subscription = $observable->subscribe(new CallbackObserver(
-            function (ObservableInterface $innerObservable) use ($observable, $observer) {
+            function (ObservableInterface $innerObservable) use ($observable, $observer): void {
                 try {
 
                     if ($this->startBuffering === true) {
@@ -53,7 +38,7 @@ function (ObservableInterface $innerObservable) use ($observable, $observer) {
                         return;
                     }
 
-                    $onCompleted = function () use (&$subscribeToInner, $observer) {
+                    $onCompleted = function () use (&$subscribeToInner, $observer): void {
 
                         $this->disposable->remove($this->innerDisposable);
                         $this->innerDisposable->dispose();
@@ -62,7 +47,7 @@ function (ObservableInterface $innerObservable) use ($observable, $observer) {
 
                         $obs = array_shift($this->buffer);
 
-                        if (empty($this->buffer)) {
+                        if ($this->buffer === []) {
                             $this->startBuffering = false;
                         }
 
@@ -73,10 +58,10 @@ function (ObservableInterface $innerObservable) use ($observable, $observer) {
                         }
                     };
 
-                    $subscribeToInner = function ($observable) use ($observer, &$onCompleted) {
+                    $subscribeToInner = function ($observable) use ($observer, &$onCompleted): void {
                         $callbackObserver = new CallbackObserver(
-                            [$observer, 'onNext'],
-                            [$observer, 'onError'],
+                            fn ($x) => $observer->onNext($x),
+                            fn ($err) => $observer->onError($err),
                             $onCompleted
                         );
 
@@ -93,8 +78,8 @@ function (ObservableInterface $innerObservable) use ($observable, $observer) {
                     $observer->onError($e);
                 }
             },
-            [$observer, 'onError'],
-            function () use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer): void {
                 $this->sourceCompleted = true;
                 if ($this->innerCompleted === true) {
                     $observer->onCompleted();
diff --git a/src/Operator/ConcatMapOperator.php b/src/Operator/ConcatMapOperator.php
index 208f4293..a2eedd8e 100644
--- a/src/Operator/ConcatMapOperator.php
+++ b/src/Operator/ConcatMapOperator.php
@@ -10,16 +10,10 @@
 
 final class ConcatMapOperator implements OperatorInterface
 {
-    /** @var callable */
-    private $selector;
-
-    /** @var callable */
-    private $resultSelector;
-
-    public function __construct(callable $selector, callable $resultSelector = null)
-    {
-        $this->selector       = $selector;
-        $this->resultSelector = $resultSelector;
+    public function __construct(
+        private $selector,
+        private $resultSelector = null
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
diff --git a/src/Operator/ConcatOperator.php b/src/Operator/ConcatOperator.php
index 40e0834c..89628359 100644
--- a/src/Operator/ConcatOperator.php
+++ b/src/Operator/ConcatOperator.php
@@ -10,18 +10,10 @@
 use Rx\Observer\CallbackObserver;
 use Rx\ObserverInterface;
 
-final class ConcatOperator implements OperatorInterface
+final readonly class ConcatOperator implements OperatorInterface
 {
-    /** @var \Rx\ObservableInterface */
-    private $subsequentObservable;
-
-    /**
-     * Concat constructor.
-     * @param ObservableInterface $subsequentObservable
-     */
-    public function __construct(ObservableInterface $subsequentObservable)
+    public function __construct(private ObservableInterface $subsequentObservable)
     {
-        $this->subsequentObservable = $subsequentObservable;
     }
 
     /**
@@ -32,9 +24,9 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $disp = new SerialDisposable();
 
         $cbObserver = new CallbackObserver(
-            [$observer, 'onNext'],
-            [$observer, 'onError'],
-            function () use ($observer, $disp) {
+            fn ($x) => $observer->onNext($x),
+            fn ($err) => $observer->onError($err),
+            function () use ($observer, $disp): void {
                 $disp->setDisposable($this->subsequentObservable->subscribe($observer));
             }
         );
diff --git a/src/Operator/CountOperator.php b/src/Operator/CountOperator.php
index 2f0a3eef..4d62eb9a 100644
--- a/src/Operator/CountOperator.php
+++ b/src/Operator/CountOperator.php
@@ -11,18 +11,16 @@
 
 final class CountOperator implements OperatorInterface
 {
-    private $count = 0;
-    private $predicate;
-
-    public function __construct(callable $predicate = null)
-    {
-        $this->predicate = $predicate;
+    public function __construct(
+        private readonly null|\Closure $predicate = null,
+        private int                    $count = 0
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $callbackObserver = new CallbackObserver(
-            function ($x) use ($observer) {
+            function ($x) use ($observer): void {
                 if ($this->predicate === null) {
                     $this->count++;
 
@@ -37,8 +35,8 @@ function ($x) use ($observer) {
                     $observer->onError($e);
                 }
             },
-            [$observer, 'onError'],
-            function () use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer): void {
                 $observer->onNext($this->count);
                 $observer->onCompleted();
             }
diff --git a/src/Operator/DefaultIfEmptyOperator.php b/src/Operator/DefaultIfEmptyOperator.php
index 01e61ffd..9c0cba73 100644
--- a/src/Operator/DefaultIfEmptyOperator.php
+++ b/src/Operator/DefaultIfEmptyOperator.php
@@ -12,27 +12,22 @@
 
 final class DefaultIfEmptyOperator implements OperatorInterface
 {
-    /** @var  ObservableInterface */
-    private $observable;
-
-    /** @var bool */
-    private $passThrough = false;
-
-    public function __construct(ObservableInterface $observable)
-    {
-        $this->observable = $observable;
+    public function __construct(
+        private ObservableInterface $observable,
+        private bool $passThrough = false
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $disposable = new SerialDisposable();
         $cbObserver = new CallbackObserver(
-            function ($x) use ($observer) {
+            function ($x) use ($observer): void {
                 $this->passThrough = true;
                 $observer->onNext($x);
             },
-            [$observer, 'onError'],
-            function () use ($observer, $disposable) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer, $disposable): void {
                 if (!$this->passThrough) {
                     $disposable->setDisposable($this->observable->subscribe($observer));
                     return;
diff --git a/src/Operator/DeferOperator.php b/src/Operator/DeferOperator.php
index 2459deea..8b6faa8c 100644
--- a/src/Operator/DeferOperator.php
+++ b/src/Operator/DeferOperator.php
@@ -12,12 +12,8 @@
 final class DeferOperator implements OperatorInterface
 {
 
-    /* @var Callable */
-    private $factory;
-
-    public function __construct(callable $factory)
+    public function __construct(private $factory)
     {
-        $this->factory = $factory;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
diff --git a/src/Operator/DelayOperator.php b/src/Operator/DelayOperator.php
index 6e486683..86c7bd47 100644
--- a/src/Operator/DelayOperator.php
+++ b/src/Operator/DelayOperator.php
@@ -16,23 +16,16 @@
 
 final class DelayOperator implements OperatorInterface
 {
-    /** @var int */
-    private $delayTime;
-
-    /** @var \SplQueue */
-    private $queue;
+    private \SplQueue $queue;
 
     /** @var DisposableInterface */
     private $schedulerDisposable;
 
-    /** @var AsyncSchedulerInterface */
-    private $scheduler;
-
-    public function __construct(int $delayTime, AsyncSchedulerInterface $scheduler)
-    {
-        $this->delayTime = $delayTime;
+    public function __construct(
+        private readonly int                     $delayTime,
+        private readonly AsyncSchedulerInterface $scheduler
+    ) {
         $this->queue     = new \SplQueue();
-        $this->scheduler = $scheduler;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -41,18 +34,18 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $disp = $observable
             ->materialize()
             ->timestamp($this->scheduler)
-            ->map(function (Timestamped $x) {
+            ->map(function (Timestamped $x): \Rx\Timestamped {
                 return new Timestamped($x->getTimestampMillis() + $this->delayTime, $x->getValue());
             })
             ->subscribe(new CallbackObserver(
-                function (Timestamped $x) use ($observer) {
+                function (Timestamped $x) use ($observer): void {
                     if ($x->getValue() instanceof Notification\OnErrorNotification) {
                         $x->getValue()->accept($observer);
                         return;
                     }
                     $this->queue->enqueue($x);
                     if ($this->schedulerDisposable === null) {
-                        $doScheduledStuff = function () use ($observer, &$doScheduledStuff) {
+                        $doScheduledStuff = function () use ($observer, &$doScheduledStuff): void {
                             while ((!$this->queue->isEmpty()) && $this->scheduler->now() >= $this->queue->bottom()->getTimestampMillis()) {
                                 /** @var Timestamped $item */
                                 $item = $this->queue->dequeue();
@@ -77,7 +70,7 @@ function (Timestamped $x) use ($observer) {
                 [$observer, 'onError']
             ));
 
-        return new CallbackDisposable(function () use ($disp) {
+        return new CallbackDisposable(function () use ($disp): void {
             if ($this->schedulerDisposable) {
                 $this->schedulerDisposable->dispose();
             }
diff --git a/src/Operator/DematerializeOperator.php b/src/Operator/DematerializeOperator.php
index 791cf0de..133fd913 100644
--- a/src/Operator/DematerializeOperator.php
+++ b/src/Operator/DematerializeOperator.php
@@ -15,11 +15,11 @@ final class DematerializeOperator implements OperatorInterface
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         return $observable->subscribe(new CallbackObserver(
-            function (Notification $x) use ($observer) {
+            function (Notification $x) use ($observer): void {
                 $x->accept($observer);
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         ));
     }
 }
diff --git a/src/Operator/DistinctOperator.php b/src/Operator/DistinctOperator.php
index 095c63f3..87b06b9f 100644
--- a/src/Operator/DistinctOperator.php
+++ b/src/Operator/DistinctOperator.php
@@ -13,17 +13,10 @@
 
 final class DistinctOperator implements OperatorInterface
 {
-
-    /** @var callable */
-    protected $keySelector;
-
-    /** @var callable */
-    protected $comparer;
-
-    public function __construct(callable $keySelector = null, callable $comparer = null)
-    {
-        $this->comparer = $comparer;
-        $this->keySelector = $keySelector;
+    public function __construct(
+        private readonly null|\Closure $keySelector = null,
+        private readonly null|\Closure $comparer = null
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -58,8 +51,8 @@ function ($value) use ($observer, &$values) {
                     return $observer->onError($e);
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($callbackObserver);
diff --git a/src/Operator/DistinctUntilChangedOperator.php b/src/Operator/DistinctUntilChangedOperator.php
index 11a98ab5..bd7c1dd1 100644
--- a/src/Operator/DistinctUntilChangedOperator.php
+++ b/src/Operator/DistinctUntilChangedOperator.php
@@ -11,17 +11,13 @@
 
 final class DistinctUntilChangedOperator implements OperatorInterface
 {
-    protected $keySelector;
-
-    protected $comparer;
-
-    public function __construct(callable $keySelector = null, callable $comparer = null)
-    {
-        $this->comparer = $comparer ?: function ($x, $y) {
+    public function __construct(
+        private readonly null|\Closure $keySelector = null,
+        protected null|\Closure        $comparer = null
+    ) {
+        $this->comparer = $comparer ?: function ($x, $y): bool {
             return $x == $y;
         };
-
-        $this->keySelector = $keySelector;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -55,8 +51,8 @@ function ($value) use ($observer, &$hasCurrentKey, &$currentKey) {
                 }
 
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($cbObserver);
diff --git a/src/Operator/DoOnEachOperator.php b/src/Operator/DoOnEachOperator.php
index 4358757d..b3fcc2e6 100644
--- a/src/Operator/DoOnEachOperator.php
+++ b/src/Operator/DoOnEachOperator.php
@@ -11,11 +11,8 @@
 
 final class DoOnEachOperator implements OperatorInterface
 {
-    private $onEachObserver;
-
-    public function __construct(ObserverInterface $observer)
+    public function __construct(private ObserverInterface $onEachObserver)
     {
-        $this->onEachObserver = $observer;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
diff --git a/src/Operator/FilterOperator.php b/src/Operator/FilterOperator.php
index a6e7bea7..3ddcff3c 100644
--- a/src/Operator/FilterOperator.php
+++ b/src/Operator/FilterOperator.php
@@ -11,17 +11,14 @@
 
 final class FilterOperator implements OperatorInterface
 {
-    private $predicate;
-
-    public function __construct(callable $predicate)
+    public function __construct(private readonly null|\Closure $predicate)
     {
-        $this->predicate = $predicate;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $selectObserver = new CallbackObserver(
-            function ($nextValue) use ($observer) {
+            function ($nextValue) use ($observer): void {
                 $shouldFire = false;
                 try {
                     $shouldFire = ($this->predicate)($nextValue);
@@ -33,8 +30,8 @@ function ($nextValue) use ($observer) {
                     $observer->onNext($nextValue);
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($selectObserver);
diff --git a/src/Operator/FinallyOperator.php b/src/Operator/FinallyOperator.php
index e9ca6fd2..d7f3ecf8 100644
--- a/src/Operator/FinallyOperator.php
+++ b/src/Operator/FinallyOperator.php
@@ -10,22 +10,10 @@
 
 final class FinallyOperator implements OperatorInterface
 {
-    /** @var callable */
-    private $callback;
-
-    /**
-     * @param callable $callback
-     */
-    public function __construct(callable $callback)
+    public function __construct(private readonly null|\Closure $callback)
     {
-        $this->callback = $callback;
     }
 
-    /**
-     * @param \Rx\ObservableInterface $observable
-     * @param \Rx\ObserverInterface $observer
-     * @return \Rx\DisposableInterface
-     */
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         return new BinaryDisposable(
diff --git a/src/Operator/GroupByUntilOperator.php b/src/Operator/GroupByUntilOperator.php
index 62946d73..9ca86d16 100644
--- a/src/Operator/GroupByUntilOperator.php
+++ b/src/Operator/GroupByUntilOperator.php
@@ -16,14 +16,13 @@
 
 final class GroupByUntilOperator implements OperatorInterface
 {
-    private $keySelector;
-    private $elementSelector;
-    private $durationSelector;
-    private $keySerializer;
-    private $map = [];
-
-    public function __construct(callable $keySelector, callable $elementSelector = null, callable $durationSelector = null, callable $keySerializer = null)
-    {
+    public function __construct(
+        private readonly null|\Closure $keySelector,
+        private null|\Closure          $elementSelector = null,
+        private null|\Closure          $durationSelector = null,
+        private null|\Closure          $keySerializer = null,
+        private array                  $map = []
+    ) {
         if (null === $elementSelector) {
             $elementSelector = function ($elem) {
                 return $elem;
@@ -42,7 +41,6 @@ public function __construct(callable $keySelector, callable $elementSelector = n
             };
         }
 
-        $this->keySelector      = $keySelector;
         $this->elementSelector  = $elementSelector;
         $this->durationSelector = $durationSelector;
         $this->keySerializer    = $keySerializer;
@@ -54,17 +52,15 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $refCountDisposable = new RefCountDisposable($groupDisposable);
         $sourceEmits        = true;
 
-        $handleError = function (\Throwable $e) use ($observer, &$sourceEmits) {
+        $handleError = function (\Throwable $e) use ($observer, &$sourceEmits): void {
             foreach ($this->map as $w) {
                 $w->onError($e);
             }
-            if ($sourceEmits) {
-                $observer->onError($e);
-            }
+            $observer->onError($e);
         };
 
         $subscription = $observable->subscribe(
-            function ($element) use ($observer, $handleError, $refCountDisposable, $groupDisposable, &$sourceEmits) {
+            function ($element) use ($observer, $handleError, $refCountDisposable, $groupDisposable, &$sourceEmits): void {
                 try {
                     $key           = call_user_func($this->keySelector, $element);
                     $serializedKey = call_user_func($this->keySerializer, $key);
@@ -98,7 +94,7 @@ function ($element) use ($observer, $handleError, $refCountDisposable, $groupDis
                     $durationSubscription = $duration->take(1)->subscribe(
                         null,
                         $handleError,
-                        function () use ($groupDisposable, $md, $writer, $serializedKey) {
+                        function () use ($groupDisposable, $md, $writer, $serializedKey): void {
                             unset($this->map[$serializedKey]);
                             $writer->onCompleted();
 
@@ -120,18 +116,16 @@ function () use ($groupDisposable, $md, $writer, $serializedKey) {
                 $this->map[$serializedKey]->onNext($element);
             },
             $handleError,
-            function () use ($observer, &$sourceEmits) {
+            function () use ($observer, &$sourceEmits): void {
                 foreach ($this->map as $w) {
                     $w->onCompleted();
                 }
-                if ($sourceEmits) {
-                    $observer->onCompleted();
-                }
+                $observer->onCompleted();
             });
 
         $groupDisposable->add($subscription);
 
-        return new CallbackDisposable(function () use (&$sourceEmits, $refCountDisposable) {
+        return new CallbackDisposable(function () use (&$sourceEmits, $refCountDisposable): void {
             $sourceEmits = false;
             $refCountDisposable->dispose();
         });
diff --git a/src/Operator/IsEmptyOperator.php b/src/Operator/IsEmptyOperator.php
index d8bf7ca8..4d5c9976 100644
--- a/src/Operator/IsEmptyOperator.php
+++ b/src/Operator/IsEmptyOperator.php
@@ -12,12 +12,12 @@ final class IsEmptyOperator implements OperatorInterface
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         return $observable->subscribe(
-            function() use ($observer) {
+            function() use ($observer): void {
                 $observer->onNext(false);
                 $observer->onCompleted();
             },
-            [$observer, 'onError'],
-            function() use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function() use ($observer): void {
                 $observer->onNext(true);
                 $observer->onCompleted();
             }
diff --git a/src/Operator/MapOperator.php b/src/Operator/MapOperator.php
index 38436d79..bd550065 100644
--- a/src/Operator/MapOperator.php
+++ b/src/Operator/MapOperator.php
@@ -13,11 +13,8 @@
 
 final class MapOperator implements OperatorInterface
 {
-    private $selector;
-
-    public function __construct(callable $selector)
+    public function __construct(private $selector)
     {
-        $this->selector = $selector;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -26,7 +23,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $disposable = new CompositeDisposable();
 
         $selectObserver = new CallbackObserver(
-            function ($nextValue) use ($observer, &$disposed) {
+            function ($nextValue) use ($observer, &$disposed): void {
 
                 $value = null;
                 try {
@@ -34,15 +31,13 @@ function ($nextValue) use ($observer, &$disposed) {
                 } catch (\Throwable $e) {
                     $observer->onError($e);
                 }
-                if (!$disposed) {
-                    $observer->onNext($value);
-                }
+                $observer->onNext($value);
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
-        $disposable->add(new CallbackDisposable(function () use (&$disposed) {
+        $disposable->add(new CallbackDisposable(function () use (&$disposed): void {
             $disposed = true;
         }));
 
diff --git a/src/Operator/MaterializeOperator.php b/src/Operator/MaterializeOperator.php
index 6859fcfc..bafcfbdc 100644
--- a/src/Operator/MaterializeOperator.php
+++ b/src/Operator/MaterializeOperator.php
@@ -17,14 +17,14 @@ final class MaterializeOperator implements OperatorInterface
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         return $observable->subscribe(new CallbackObserver(
-            function ($x) use ($observer) {
+            function ($x) use ($observer): void {
                 $observer->onNext(new OnNextNotification($x));
             },
-            function ($error) use ($observer) {
+            function ($error) use ($observer): void {
                 $observer->onNext(new OnErrorNotification($error));
                 $observer->onCompleted();
             },
-            function () use ($observer) {
+            function () use ($observer): void {
                 $observer->onNext(new OnCompletedNotification());
                 $observer->onCompleted();
             }
diff --git a/src/Operator/MaxOperator.php b/src/Operator/MaxOperator.php
index d444dd5e..79ba87a1 100644
--- a/src/Operator/MaxOperator.php
+++ b/src/Operator/MaxOperator.php
@@ -11,12 +11,10 @@
 
 final class MaxOperator implements OperatorInterface
 {
-    private $comparer;
-
-    public function __construct(callable $comparer = null)
+    public function __construct(private null|\Closure $comparer = null)
     {
         if ($comparer === null) {
-            $comparer = function ($x, $y) {
+            $comparer = function ($x, $y): int {
                 return $x > $y ? 1 : ($x < $y ? -1 : 0);
             };
         }
@@ -30,7 +28,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $comparing   = false;
 
         return $observable->subscribe(new CallbackObserver(
-            function ($x) use (&$comparing, &$previousMax, $observer) {
+            function ($x) use (&$comparing, &$previousMax, $observer): void {
                 if (!$comparing) {
                     $comparing   = true;
                     $previousMax = $x;
@@ -47,8 +45,8 @@ function ($x) use (&$comparing, &$previousMax, $observer) {
                     $observer->onError($e);
                 }
             },
-            [$observer, 'onError'],
-            function () use (&$comparing, &$previousMax, $observer) {
+            fn ($err) => $observer->onError($err),
+            function () use (&$comparing, &$previousMax, $observer): void {
                 if ($comparing) {
                     $observer->onNext($previousMax);
                     $observer->onCompleted();
diff --git a/src/Operator/MergeAllOperator.php b/src/Operator/MergeAllOperator.php
index 5cd63403..22fa83ee 100644
--- a/src/Operator/MergeAllOperator.php
+++ b/src/Operator/MergeAllOperator.php
@@ -22,19 +22,19 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $group->add($sourceSubscription);
 
         $callbackObserver = new CallbackObserver(
-            function (ObservableInterface $innerSource) use (&$group, &$isStopped, $observer) {
+            function (ObservableInterface $innerSource) use (&$group, &$isStopped, $observer): void {
                 $innerSubscription = new SingleAssignmentDisposable();
                 $group->add($innerSubscription);
 
                 $innerSubscription->setDisposable(
                     $innerSource->subscribe(new CallbackObserver(
-                        function ($nextValue) use ($observer) {
+                        function ($nextValue) use ($observer): void {
                             $observer->onNext($nextValue);
                         },
-                        function ($error) use ($observer) {
+                        function ($error) use ($observer): void {
                             $observer->onError($error);
                         },
-                        function () use (&$group, &$innerSubscription, &$isStopped, $observer) {
+                        function () use (&$group, &$innerSubscription, &$isStopped, $observer): void {
                             $group->remove($innerSubscription);
 
                             if ($isStopped && $group->count() === 1) {
@@ -44,8 +44,8 @@ function () use (&$group, &$innerSubscription, &$isStopped, $observer) {
                     ))
                 );
             },
-            [$observer, 'onError'],
-            function () use (&$group, &$isStopped, $observer) {
+            fn ($err) => $observer->onError($err),
+            function () use (&$group, &$isStopped, $observer): void {
                 $isStopped = true;
                 if ($group->count() === 1) {
                     $observer->onCompleted();
diff --git a/src/Operator/MinOperator.php b/src/Operator/MinOperator.php
index 4bd85389..a46d7f2a 100644
--- a/src/Operator/MinOperator.php
+++ b/src/Operator/MinOperator.php
@@ -11,12 +11,10 @@
 
 final class MinOperator implements OperatorInterface
 {
-    private $comparer;
-
-    public function __construct(callable $comparer = null)
+    public function __construct(private null|\Closure $comparer = null)
     {
         if ($comparer === null) {
-            $comparer = function ($x, $y) {
+            $comparer = function ($x, $y): int {
                 return $x > $y ? 1 : ($x < $y ? -1 : 0);
             };
         }
@@ -30,7 +28,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $comparing   = false;
 
         return $observable->subscribe(new CallbackObserver(
-            function ($x) use (&$comparing, &$previousMin, $observer) {
+            function ($x) use (&$comparing, &$previousMin, $observer): void {
                 if (!$comparing) {
                     $comparing   = true;
                     $previousMin = $x;
@@ -47,8 +45,8 @@ function ($x) use (&$comparing, &$previousMin, $observer) {
                     $observer->onError($e);
                 }
             },
-            [$observer, 'onError'],
-            function () use (&$comparing, &$previousMin, $observer) {
+            fn ($err) => $observer->onError($err),
+            function () use (&$comparing, &$previousMin, $observer): void {
                 if ($comparing) {
                     $observer->onNext($previousMin);
                     $observer->onCompleted();
diff --git a/src/Operator/RaceOperator.php b/src/Operator/RaceOperator.php
index b5438267..8eb1fc53 100644
--- a/src/Operator/RaceOperator.php
+++ b/src/Operator/RaceOperator.php
@@ -15,17 +15,15 @@
 final class RaceOperator implements OperatorInterface
 {
 
-    /** @var bool */
-    private $hasFirst = false;
+    private bool $hasFirst = false;
 
     /** @var Observable[] */
-    private $observables = [];
+    private ?array $observables = [];
 
     /** @var DisposableInterface[] */
-    private $subscriptions = [];
+    private array $subscriptions = [];
 
-    /** @var CompositeDisposable */
-    private $innerSubscription;
+    private CompositeDisposable $innerSubscription;
 
 
     public function __construct()
@@ -37,11 +35,11 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
     {
 
         $callbackObserver = new CallbackObserver(
-            function (Observable $innerObservable) {
+            function (Observable $innerObservable): void {
                 $this->observables[] = $innerObservable;
             },
-            [$observer, 'onError'],
-            function () use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer): void {
 
                 if (count($this->observables) === 0) {
                     $observer->onCompleted();
@@ -65,10 +63,10 @@ function () use ($observer) {
 
     }
 
-    private function subscribeToResult(ObservableInterface $observable, ObserverInterface $observer, $outerIndex)
+    private function subscribeToResult(ObservableInterface $observable, ObserverInterface $observer, $outerIndex): \Rx\DisposableInterface
     {
         return $observable->subscribe(new CallbackObserver(
-            function ($value) use ($observer, $outerIndex) {
+            function ($value) use ($observer, $outerIndex): void {
 
                 if (!$this->hasFirst) {
                     $this->hasFirst = true;
@@ -85,8 +83,8 @@ function ($value) use ($observer, $outerIndex) {
                 $observer->onNext($value);
 
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
 
         ));
     }
diff --git a/src/Operator/ReduceOperator.php b/src/Operator/ReduceOperator.php
index 6ff158f9..399e0c70 100644
--- a/src/Operator/ReduceOperator.php
+++ b/src/Operator/ReduceOperator.php
@@ -11,19 +11,10 @@
 
 final class ReduceOperator implements OperatorInterface
 {
-    /** @var  callable */
-    protected $accumulator;
-    protected $seed;
-    protected $hasSeed;
+    protected bool $hasSeed;
 
-    /**
-     * @param callable $accumulator
-     * @param $seed
-     */
-    public function __construct(callable $accumulator, $seed)
+    public function __construct(private readonly null|\Closure $accumulator, protected $seed)
     {
-        $this->accumulator = $accumulator;
-        $this->seed        = $seed;
         $this->hasSeed     = null !== $seed;
     }
 
@@ -33,7 +24,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $accumulation    = null;
         $hasValue        = false;
         $cbObserver      = new CallbackObserver(
-            function ($x) use ($observer, &$hasAccumulation, &$accumulation, &$hasValue) {
+            function ($x) use ($observer, &$hasAccumulation, &$accumulation, &$hasValue): void {
 
                 $hasValue = true;
 
@@ -48,10 +39,10 @@ function ($x) use ($observer, &$hasAccumulation, &$accumulation, &$hasValue) {
                     $observer->onError($e);
                 }
             },
-            function ($e) use ($observer) {
+            function ($e) use ($observer): void {
                 $observer->onError($e);
             },
-            function () use ($observer, &$hasAccumulation, &$accumulation, &$hasValue) {
+            function () use ($observer, &$hasAccumulation, &$accumulation, &$hasValue): void {
                 if ($hasValue) {
                     $observer->onNext($accumulation);
                 } else {
diff --git a/src/Operator/RepeatOperator.php b/src/Operator/RepeatOperator.php
index e11ccdae..29d78052 100644
--- a/src/Operator/RepeatOperator.php
+++ b/src/Operator/RepeatOperator.php
@@ -13,9 +13,7 @@
 
 final class RepeatOperator implements OperatorInterface
 {
-    private $repeatCount;
-
-    public function __construct(int $repeatCount = -1)
+    public function __construct(private int $repeatCount = -1)
     {
         if ($repeatCount < 0) {
             $repeatCount = -1;
@@ -30,11 +28,11 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
 
         $disposable = new SerialDisposable();
 
-        $subscribe = function () use (&$disposable, $observable, $observer, &$completeCount, &$subscribe) {
+        $subscribe = function () use (&$disposable, $observable, $observer, &$completeCount, &$subscribe): void {
             $disposable->setDisposable($observable->subscribe(new CallbackObserver(
-                [$observer, 'onNext'],
-                [$observer, 'onError'],
-                function () use (&$completeCount, $observable, $observer, &$disposable, &$subscribe) {
+                fn ($x) => $observer->onNext($x),
+                fn ($err) => $observer->onError($err),
+                function () use (&$completeCount, $observable, $observer, &$disposable, &$subscribe): void {
                     $completeCount++;
                     if ($this->repeatCount === -1 || $completeCount < $this->repeatCount) {
                         $subscribe();
@@ -49,7 +47,7 @@ function () use (&$completeCount, $observable, $observer, &$disposable, &$subscr
 
         $subscribe();
 
-        return new CallbackDisposable(function () use (&$disposable) {
+        return new CallbackDisposable(function () use (&$disposable): void {
             $disposable->dispose();
         });
     }
diff --git a/src/Operator/RepeatWhenOperator.php b/src/Operator/RepeatWhenOperator.php
index ccc84cfe..54bbdc45 100644
--- a/src/Operator/RepeatWhenOperator.php
+++ b/src/Operator/RepeatWhenOperator.php
@@ -15,36 +15,18 @@
 
 final class RepeatWhenOperator implements OperatorInterface
 {
-    /** @var callable */
-    private $notificationHandler;
-
-    /** @var Subject */
-    private $completions;
-
-    /** @var Subject */
-    private $notifier;
-
-    /** @var CompositeDisposable */
-    private $disposable;
-
-    /** @var bool */
-    private $repeat;
-
-    /** @var int */
-    private $count;
-
-    /** @var bool */
-    private $sourceComplete;
-
-    public function __construct(callable $notificationHandler)
+    private Subject $completions;
+    private Subject $notifier;
+    private CompositeDisposable $disposable;
+    private bool $repeat = true;
+    private int $count = 0;
+    private bool $sourceComplete = false;
+
+    public function __construct(private $notificationHandler)
     {
-        $this->notificationHandler = $notificationHandler;
         $this->completions         = new Subject();
         $this->disposable          = new CompositeDisposable();
         $this->notifier            = new Subject();
-        $this->repeat              = true;
-        $this->count               = 0;
-        $this->sourceComplete      = false;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -52,12 +34,12 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $outerDisposable = new SerialDisposable();
         $this->disposable->add($outerDisposable);
 
-        $subscribe = function () use ($outerDisposable, $observable, $observer, &$subscribe) {
+        $subscribe = function () use ($outerDisposable, $observable, $observer, &$subscribe): void {
             $this->sourceComplete = false;
             $outerSubscription    = $observable->subscribe(new CallbackObserver(
-                [$observer, 'onNext'],
-                [$observer, 'onError'],
-                function () use ($observer, &$subscribe, $outerDisposable) {
+                fn ($x) => $observer->onNext($x),
+                fn ($err) => $observer->onError($err),
+                function () use ($observer, &$subscribe, $outerDisposable): void {
                     $this->sourceComplete = true;
                     if (!$this->repeat) {
                         $observer->onCompleted();
@@ -72,14 +54,14 @@ function () use ($observer, &$subscribe, $outerDisposable) {
         };
 
         $notifierDisposable = $this->notifier->subscribe(new CallbackObserver(
-            function () use (&$subscribe) {
+            function () use (&$subscribe): void {
                 $subscribe();
             },
-            function ($ex) use ($observer) {
+            function ($ex) use ($observer): void {
                 $this->repeat = false;
                 $observer->onError($ex);
             },
-            function () use ($observer) {
+            function () use ($observer): void {
                 $this->repeat = false;
                 if ($this->sourceComplete) {
                     $observer->onCompleted();
diff --git a/src/Operator/RetryOperator.php b/src/Operator/RetryOperator.php
index b2eaf85b..ef8960e6 100644
--- a/src/Operator/RetryOperator.php
+++ b/src/Operator/RetryOperator.php
@@ -13,21 +13,18 @@
 
 final class RetryOperator implements OperatorInterface
 {
-    private $retryCount;
-
-    public function __construct(int $retryCount = -1)
+    public function __construct(private int $retryCount = -1)
     {
-        $this->retryCount = $retryCount;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $disposable = new SerialDisposable();
 
-        $getNewObserver = function () use ($observable, $observer, $disposable, &$getNewObserver) {
+        $getNewObserver = function () use ($observable, $observer, $disposable, &$getNewObserver): \Rx\Observer\CallbackObserver {
             return new CallbackObserver(
-                [$observer, 'onNext'],
-                function ($error) use ($observable, $observer, $disposable, &$getNewObserver) {
+                fn ($x) => $observer->onNext($x),
+                function ($error) use ($observable, $observer, $disposable, &$getNewObserver): void {
                     $this->retryCount--;
                     if ($this->retryCount === 0) {
                         $observer->onError($error);
@@ -37,7 +34,7 @@ function ($error) use ($observable, $observer, $disposable, &$getNewObserver) {
                     $subscription = $observable->subscribe($getNewObserver());
                     $disposable->setDisposable($subscription);
                 },
-                function () use ($observer) {
+                function () use ($observer): void {
                     $observer->onCompleted();
                     $this->retryCount = 0;
                 }
@@ -47,7 +44,7 @@ function () use ($observer) {
         $subscription = $observable->subscribe($getNewObserver());
         $disposable->setDisposable($subscription);
 
-        return new CallbackDisposable(function () use (&$disposable) {
+        return new CallbackDisposable(function () use (&$disposable): void {
             $disposable->dispose();
         });
     }
diff --git a/src/Operator/RetryWhenOperator.php b/src/Operator/RetryWhenOperator.php
index 17a91350..5bbc93df 100644
--- a/src/Operator/RetryWhenOperator.php
+++ b/src/Operator/RetryWhenOperator.php
@@ -14,11 +14,8 @@
 
 final class RetryWhenOperator implements OperatorInterface
 {
-    private $notificationHandler;
-
-    public function __construct(callable $notificationHandler)
+    public function __construct(private $notificationHandler)
     {
-        $this->notificationHandler = $notificationHandler;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -36,10 +33,10 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
             return new EmptyDisposable();
         }
 
-        $subscribeToSource = function () use ($observer, $disposable, $observable, &$sourceError, $errors, &$sourceDisposable, &$innerCompleted) {
+        $subscribeToSource = function () use ($observer, $disposable, $observable, &$sourceError, $errors, &$sourceDisposable, &$innerCompleted): void {
             $sourceError      = false;
             $sourceDisposable = $observable->subscribe(new CallbackObserver(
-                [$observer, 'onNext'],
+                fn ($x) => $observer->onNext($x),
                 function ($err) use (
                     &$sourceError,
                     $errors,
@@ -47,7 +44,7 @@ function ($err) use (
                     &$sourceDisposable,
                     &$innerCompleted,
                     $observer
-                ) {
+                ): void {
                     $sourceError = true;
                     $disposable->remove($sourceDisposable);
                     $sourceDisposable->dispose();
@@ -58,21 +55,21 @@ function ($err) use (
                     }
                     $errors->onNext($err);
                 },
-                [$observer, 'onCompleted']
+                fn () => $observer->onCompleted()
             ));
 
             $disposable->add($sourceDisposable);
         };
 
         $whenDisposable = $when->subscribe(new CallbackObserver(
-            function ($x) use ($subscribeToSource, &$sourceError) {
+            function ($x) use ($subscribeToSource, &$sourceError): void {
                 if ($sourceError) {
                     $sourceError = false;
                     $subscribeToSource();
                 }
             },
-            [$observer, 'onError'],
-            function () use (&$innerCompleted, &$sourceError, $observer) {
+            fn ($err) => $observer->onError($err),
+            function () use (&$innerCompleted, &$sourceError, $observer): void {
                 $innerCompleted = true;
                 if ($sourceError) {
                     $observer->onCompleted();
diff --git a/src/Operator/ScanOperator.php b/src/Operator/ScanOperator.php
index 3b38a4b3..efff9f03 100644
--- a/src/Operator/ScanOperator.php
+++ b/src/Operator/ScanOperator.php
@@ -11,14 +11,10 @@
 
 final class ScanOperator implements OperatorInterface
 {
-    private $accumulator;
-
-    private $seed;
-
-    public function __construct(callable $accumulator, $seed = null)
-    {
-        $this->accumulator = $accumulator;
-        $this->seed        = $seed;
+    public function __construct(
+        private readonly null|\Closure $accumulator,
+        private $seed = null
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -28,7 +24,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $accumulation    = $this->seed;
         $hasSeed         = $this->seed !== null;
         $cbObserver      = new CallbackObserver(
-            function ($x) use ($observer, &$hasAccumulation, &$accumulation, &$hasSeed, &$hasValue) {
+            function ($x) use ($observer, &$hasAccumulation, &$accumulation, &$hasSeed, &$hasValue): void {
                 $hasValue = true;
                 if ($hasAccumulation) {
                     $accumulation = ($this->tryCatch($this->accumulator))($accumulation, $x);
@@ -42,8 +38,8 @@ function ($x) use ($observer, &$hasAccumulation, &$accumulation, &$hasSeed, &$ha
                 }
                 $observer->onNext($accumulation);
             },
-            [$observer, 'onError'],
-            function () use ($observer, &$hasValue, &$hasSeed) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer, &$hasValue, &$hasSeed): void {
                 if (!$hasValue && $hasSeed) {
                     $observer->onNext($this->seed);
                 }
diff --git a/src/Operator/SkipLastOperator.php b/src/Operator/SkipLastOperator.php
index 45f97c68..3129a0bc 100644
--- a/src/Operator/SkipLastOperator.php
+++ b/src/Operator/SkipLastOperator.php
@@ -11,14 +11,10 @@
 
 final class SkipLastOperator implements OperatorInterface
 {
-    private $count;
+    private array $q = [];
 
-    /** @var array */
-    private $q;
-
-    public function __construct(int $count)
+    public function __construct(private readonly int $count)
     {
-        $this->count = $count;
         if ($this->count < 0) {
             throw new \InvalidArgumentException('Argument Out of Range');
         }
@@ -28,14 +24,14 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
     {
         $this->q    = [];
         $cbObserver = new CallbackObserver(
-            function ($x) use ($observer) {
+            function ($x) use ($observer): void {
                 $this->q[] = $x;
                 if (count($this->q) > $this->count) {
                     $observer->onNext(array_shift($this->q));
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($cbObserver);
diff --git a/src/Operator/SkipOperator.php b/src/Operator/SkipOperator.php
index 56c6f6cf..b6373dd7 100644
--- a/src/Operator/SkipOperator.php
+++ b/src/Operator/SkipOperator.php
@@ -11,9 +11,7 @@
 
 final class SkipOperator implements OperatorInterface
 {
-    private $count;
-
-    public function __construct(int $count)
+    public function __construct(private int $count)
     {
         if ($count < 0) {
             throw new \InvalidArgumentException('Count must be >= 0');
@@ -27,15 +25,15 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $remaining = $this->count;
 
         $cbObserver = new CallbackObserver(
-            function ($nextValue) use ($observer, &$remaining) {
+            function ($nextValue) use ($observer, &$remaining): void {
                 if ($remaining <= 0) {
                     $observer->onNext($nextValue);
                 } else {
                     $remaining--;
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($cbObserver);
diff --git a/src/Operator/SkipUntilOperator.php b/src/Operator/SkipUntilOperator.php
index f38107d2..787c7f2a 100644
--- a/src/Operator/SkipUntilOperator.php
+++ b/src/Operator/SkipUntilOperator.php
@@ -13,11 +13,8 @@
 
 final class SkipUntilOperator implements OperatorInterface
 {
-    private $other;
-
-    public function __construct(ObservableInterface $other)
+    public function __construct(private ObservableInterface $other)
     {
-        $this->other = $other;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -28,28 +25,28 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
 
         /** @var DisposableInterface $otherDisposable */
         $otherDisposable = $this->other->subscribe(new CallbackObserver(
-            function ($x) use (&$isOpen, &$otherDisposable) {
+            function ($x) use (&$isOpen, &$otherDisposable): void {
                 $isOpen = true;
                 $otherDisposable->dispose();
             },
-            function ($e) use ($observer) {
+            function ($e) use ($observer): void {
                 $observer->onError($e);
             },
-            function () use (&$otherDisposable) {
+            function () use (&$otherDisposable): void {
                 $otherDisposable->dispose();
             }
         ));
 
         $sourceDisposable = $observable->subscribe(new CallbackObserver(
-            function ($x) use ($observer, &$isOpen) {
+            function ($x) use ($observer, &$isOpen): void {
                 if ($isOpen) {
                     $observer->onNext($x);
                 }
             },
-            function ($e) use ($observer) {
+            function ($e) use ($observer): void {
                 $observer->onError($e);
             },
-            function () use ($observer, &$isOpen) {
+            function () use ($observer, &$isOpen): void {
                 if ($isOpen) {
                     $observer->onCompleted();
                 }
diff --git a/src/Operator/SkipWhileOperator.php b/src/Operator/SkipWhileOperator.php
index 2e2206b8..56034373 100644
--- a/src/Operator/SkipWhileOperator.php
+++ b/src/Operator/SkipWhileOperator.php
@@ -11,22 +11,16 @@
 
 final class SkipWhileOperator implements OperatorInterface
 {
-    /** @var callable */
-    private $predicate;
+    private bool $isSkipping = true;
 
-    /** @var bool */
-    private $isSkipping;
-
-    public function __construct(callable $predicate)
+    public function __construct(private readonly null|\Closure $predicate)
     {
-        $this->predicate  = $predicate;
-        $this->isSkipping = true;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $callbackObserver = new CallbackObserver(
-            function ($value) use ($observer, $observable) {
+            function ($value) use ($observer, $observable): void {
                 try {
 
                     if ($this->isSkipping) {
@@ -41,8 +35,8 @@ function ($value) use ($observer, $observable) {
                     $observer->onError($e);
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($callbackObserver);
diff --git a/src/Operator/StartWithArrayOperator.php b/src/Operator/StartWithArrayOperator.php
index 62441456..ed8a66e2 100644
--- a/src/Operator/StartWithArrayOperator.php
+++ b/src/Operator/StartWithArrayOperator.php
@@ -10,15 +10,12 @@
 use Rx\ObserverInterface;
 use Rx\SchedulerInterface;
 
-final class StartWithArrayOperator implements OperatorInterface
+final readonly class StartWithArrayOperator implements OperatorInterface
 {
-    private $startArray;
-    private $scheduler;
-
-    public function __construct(array $startArray, SchedulerInterface $scheduler)
-    {
-        $this->startArray = $startArray;
-        $this->scheduler  = $scheduler;
+    public function __construct(
+        private array              $startArray,
+        private SchedulerInterface $scheduler
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
diff --git a/src/Operator/SubscribeOnOperator.php b/src/Operator/SubscribeOnOperator.php
index 473f4dcb..de7d9286 100644
--- a/src/Operator/SubscribeOnOperator.php
+++ b/src/Operator/SubscribeOnOperator.php
@@ -14,11 +14,8 @@
 
 final class SubscribeOnOperator implements OperatorInterface
 {
-    private $scheduler;
-
-    public function __construct(SchedulerInterface $scheduler)
+    public function __construct(private readonly SchedulerInterface $scheduler)
     {
-        $this->scheduler = $scheduler;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -28,7 +25,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $disposable->setDisposable($singleDisposable);
 
         $singleDisposable->setDisposable(
-            $this->scheduler->schedule(function () use ($disposable, $observer, $observable) {
+            $this->scheduler->schedule(function () use ($disposable, $observer, $observable): void {
                 $subscription = $observable->subscribe($observer);
                 $disposable->setDisposable(new ScheduledDisposable($this->scheduler, $subscription));
             })
diff --git a/src/Operator/SwitchFirstOperator.php b/src/Operator/SwitchFirstOperator.php
index 1dafe55c..f7d151b5 100644
--- a/src/Operator/SwitchFirstOperator.php
+++ b/src/Operator/SwitchFirstOperator.php
@@ -14,8 +14,8 @@
 
 final class SwitchFirstOperator implements OperatorInterface
 {
-    private $isStopped = false;
-    private $hasCurrent = false;
+    private bool $isStopped = false;
+    private bool $hasCurrent = false;
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
@@ -25,7 +25,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $disposable->add($singleDisposable);
 
         $callbackObserver = new CallbackObserver(
-            function (Observable $x) use ($disposable, $observer) {
+            function (Observable $x) use ($disposable, $observer): void {
                 if ($this->hasCurrent) {
                     return;
                 }
@@ -35,9 +35,9 @@ function (Observable $x) use ($disposable, $observer) {
                 $disposable->add($inner);
 
                 $innerSub = $x->subscribe(new CallbackObserver(
-                    [$observer, 'onNext'],
-                    [$observer, 'onError'],
-                    function () use ($disposable, $inner, $observer) {
+                    fn ($x) => $observer->onNext($x),
+                    fn ($err) => $observer->onError($err),
+                    function () use ($disposable, $inner, $observer): void {
                         $disposable->remove($inner);
                         $this->hasCurrent = false;
 
@@ -49,8 +49,8 @@ function () use ($disposable, $inner, $observer) {
 
                 $inner->setDisposable($innerSub);
             },
-            [$observer, 'onError'],
-            function () use ($disposable, $observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($disposable, $observer): void {
                 $this->isStopped = true;
                 if (!$this->hasCurrent && $disposable->count() === 1) {
                     $observer->onCompleted();
diff --git a/src/Operator/SwitchLatestOperator.php b/src/Operator/SwitchLatestOperator.php
index e3b5ad46..d0a319ba 100644
--- a/src/Operator/SwitchLatestOperator.php
+++ b/src/Operator/SwitchLatestOperator.php
@@ -14,29 +14,22 @@
 
 final class SwitchLatestOperator implements OperatorInterface
 {
-    /** @var bool */
-    private $hasLatest;
+    private bool $hasLatest = false;
 
-    /** @var bool */
-    private $isStopped;
+    private bool $isStopped = false;
 
-    /** @var int */
-    private $latest;
+    private int $latest = 0;
 
-    /** @var SerialDisposable */
-    private $innerSubscription;
+    private SerialDisposable $innerSubscription;
 
     public function __construct()
     {
-        $this->hasLatest         = false;
-        $this->isStopped         = false;
-        $this->latest            = 0;
         $this->innerSubscription = new SerialDisposable();
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
-        $onNext = function ($innerSource) use ($observer) {
+        $onNext = function ($innerSource) use ($observer): void {
             $innerDisposable = new SingleAssignmentDisposable();
 
             $id = ++$this->latest;
@@ -45,17 +38,17 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
             $this->innerSubscription->setDisposable($innerDisposable);
 
             $innerCallbackObserver = new CallbackObserver(
-                function ($x) use ($id, $observer) {
+                function ($x) use ($id, $observer): void {
                     if ($this->latest === $id) {
                         $observer->onNext($x);
                     }
                 },
-                function ($e) use ($id, $observer) {
+                function ($e) use ($id, $observer): void {
                     if ($this->latest === $id) {
                         $observer->onError($e);
                     }
                 },
-                function () use ($id, $observer) {
+                function () use ($id, $observer): void {
                     if ($this->latest === $id) {
                         $this->hasLatest = false;
                         if ($this->isStopped) {
@@ -71,8 +64,8 @@ function () use ($id, $observer) {
 
         $callbackObserver = new CallbackObserver(
             $onNext,
-            [$observer, 'onError'],
-            function () use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer): void {
                 $this->isStopped = true;
                 if (!$this->hasLatest) {
                     $observer->onCompleted();
diff --git a/src/Operator/TakeLastOperator.php b/src/Operator/TakeLastOperator.php
index 81e3cae3..8a8b77c8 100644
--- a/src/Operator/TakeLastOperator.php
+++ b/src/Operator/TakeLastOperator.php
@@ -11,33 +11,27 @@
 
 final class TakeLastOperator implements OperatorInterface
 {
-    /** @var integer */
-    private $count;
+    private array $items = [];
 
-    /** @var array */
-    private $items = [];
-
-    public function __construct(int $count)
+    public function __construct(private readonly int $count)
     {
         if ($count < 0) {
             throw new \InvalidArgumentException('Count must be >= 0');
         }
-
-        $this->count = $count;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $callbackObserver = new CallbackObserver(
-            function ($nextValue) use ($observer) {
+            function ($nextValue) use ($observer): void {
                 $this->items[] = $nextValue;
 
                 if (count($this->items) > $this->count) {
                     array_shift($this->items);
                 }
             },
-            [$observer, 'onError'],
-            function () use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer): void {
 
                 while (count($this->items) > 0) {
                     $observer->onNext(array_shift($this->items));
diff --git a/src/Operator/TakeOperator.php b/src/Operator/TakeOperator.php
index f9585e96..fdff2efc 100644
--- a/src/Operator/TakeOperator.php
+++ b/src/Operator/TakeOperator.php
@@ -11,15 +11,11 @@
 
 final class TakeOperator implements OperatorInterface
 {
-    private $count;
-
-    public function __construct(int $count)
+    public function __construct(private readonly int $count)
     {
         if ($count < 0) {
             throw new \InvalidArgumentException('Count must be >= 0');
         }
-
-        $this->count = $count;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -27,7 +23,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $remaining = $this->count;
 
         $callbackObserver = new CallbackObserver(
-            function ($nextValue) use ($observer, &$remaining) {
+            function ($nextValue) use ($observer, &$remaining): void {
                 if ($remaining > 0) {
                     $remaining--;
                     $observer->onNext($nextValue);
@@ -36,8 +32,8 @@ function ($nextValue) use ($observer, &$remaining) {
                     }
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($callbackObserver);
diff --git a/src/Operator/TakeUntilOperator.php b/src/Operator/TakeUntilOperator.php
index 4732bb7b..1b2979ce 100644
--- a/src/Operator/TakeUntilOperator.php
+++ b/src/Operator/TakeUntilOperator.php
@@ -12,11 +12,8 @@
 
 final class TakeUntilOperator implements OperatorInterface
 {
-    private $other;
-
-    public function __construct(ObservableInterface $other)
+    public function __construct(private ObservableInterface $other)
     {
-        $this->other = $other;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -25,7 +22,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         return new CompositeDisposable([
             $this->other->subscribe(
                 new CallbackObserver(
-                    [$observer, 'onCompleted'],
+                    fn () => $observer->onCompleted(),
                     [$observer, 'onError']
                 )
             ),
diff --git a/src/Operator/TakeWhileOperator.php b/src/Operator/TakeWhileOperator.php
index 8d0fb35b..f1cd25a2 100644
--- a/src/Operator/TakeWhileOperator.php
+++ b/src/Operator/TakeWhileOperator.php
@@ -11,18 +11,15 @@
 
 final class TakeWhileOperator implements OperatorInterface
 {
-    private $predicate;
-    private $inclusive;
-
-    public function __construct(callable $predicate, bool $inclusive = false)
-    {
-        $this->predicate = $predicate;
-        $this->inclusive = $inclusive;
+    public function __construct(
+        private readonly null|\Closure $predicate,
+        private readonly bool $inclusive = false
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
-        $onNext = function ($value) use ($observer) {
+        $onNext = function ($value) use ($observer): void {
             try {
                 if (($this->predicate)($value)) {
                     $observer->onNext($value);
@@ -39,8 +36,8 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
 
         $callbackObserver = new CallbackObserver(
             $onNext,
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         );
 
         return $observable->subscribe($callbackObserver);
diff --git a/src/Operator/ThrottleOperator.php b/src/Operator/ThrottleOperator.php
index 41dc9684..0cd349e5 100644
--- a/src/Operator/ThrottleOperator.php
+++ b/src/Operator/ThrottleOperator.php
@@ -16,18 +16,14 @@
 
 final class ThrottleOperator implements OperatorInterface
 {
-    private $nextSend = 0;
+    private float|int $nextSend = 0;
 
-    private $throttleTime = 0;
+    private bool $completed = false;
 
-    private $completed = false;
-
-    private $scheduler;
-
-    public function __construct(int $debounceTime, SchedulerInterface $scheduler)
-    {
-        $this->throttleTime = $debounceTime;
-        $this->scheduler    = $scheduler;
+    public function __construct(
+        private readonly int $throttleTime,
+        private readonly SchedulerInterface $scheduler
+    ) {
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
@@ -35,7 +31,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $innerDisp = new SerialDisposable();
 
         $disp = $observable->subscribe(new CallbackObserver(
-            function ($x) use ($innerDisp, $observer) {
+            function ($x) use ($innerDisp, $observer): void {
                 $now = $this->scheduler->now();
                 if ($this->nextSend <= $now) {
                     $innerDisp->setDisposable(new EmptyDisposable());
@@ -47,7 +43,7 @@ function ($x) use ($innerDisp, $observer) {
                 $newDisp = Observable::of($x, $this->scheduler)
                     ->delay($this->nextSend - $now, $this->scheduler)
                     ->subscribe(new CallbackObserver(
-                        function ($x) use ($observer) {
+                        function ($x) use ($observer): void {
                             $observer->onNext($x);
                             $this->nextSend = $this->scheduler->now() + $this->throttleTime - 1;
                             if ($this->completed) {
@@ -59,11 +55,11 @@ function ($x) use ($observer) {
 
                 $innerDisp->setDisposable($newDisp);
             },
-            function (\Throwable $e) use ($observer, $innerDisp) {
+            function (\Throwable $e) use ($observer, $innerDisp): void {
                 $innerDisp->dispose();
                 $observer->onError($e);
             },
-            function () use ($observer) {
+            function () use ($observer): void {
                 $this->completed = true;
                 if ($this->nextSend === 0) {
                     $observer->onCompleted();
diff --git a/src/Operator/TimeoutOperator.php b/src/Operator/TimeoutOperator.php
index 4802f805..12c8e392 100644
--- a/src/Operator/TimeoutOperator.php
+++ b/src/Operator/TimeoutOperator.php
@@ -16,19 +16,13 @@
 
 final class TimeoutOperator implements OperatorInterface
 {
-    private $timeout;
+    public function __construct(
+        private readonly int                     $timeout,
+        private readonly AsyncSchedulerInterface $scheduler,
+        private null|ObservableInterface         $timeoutObservable = null
+    ) {
 
-    private $scheduler;
-
-    private $timeoutObservable;
-
-    public function __construct(int $timeout, ObservableInterface $timeoutObservable = null, AsyncSchedulerInterface $scheduler)
-    {
-        $this->timeout           = $timeout;
-        $this->scheduler         = $scheduler;
-        $this->timeoutObservable = $timeoutObservable;
-
-        if ($this->timeoutObservable === null) {
+        if (!$this->timeoutObservable instanceof \Rx\ObservableInterface) {
             $this->timeoutObservable = new ErrorObservable(new TimeoutException('timeout'), $scheduler);
         }
     }
@@ -42,7 +36,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
 
         $sourceDisposable = new EmptyDisposable();
 
-        $doTimeout = function () use ($observer, $disposable, &$sourceDisposable) {
+        $doTimeout = function () use ($observer, $disposable, &$sourceDisposable): void {
             $disposable->remove($sourceDisposable);
             $sourceDisposable->dispose();
             $disposable->add($this->timeoutObservable->subscribe($observer));
@@ -51,7 +45,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         $doTimeoutDisposable = $this->scheduler->schedule($doTimeout, $this->timeout);
         $disposable->add($doTimeoutDisposable);
 
-        $rescheduleTimeout = function () use ($disposable, &$doTimeoutDisposable, $doTimeout) {
+        $rescheduleTimeout = function () use ($disposable, &$doTimeoutDisposable, $doTimeout): void {
             $disposable->remove($doTimeoutDisposable);
             $doTimeoutDisposable->dispose();
 
@@ -60,15 +54,15 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
         };
 
         $sourceDisposable = $observable->subscribe(new CallbackObserver(
-            function ($x) use ($observer, $rescheduleTimeout) {
+            function ($x) use ($observer, $rescheduleTimeout): void {
                 $rescheduleTimeout();
                 $observer->onNext($x);
             },
-            function ($err) use ($observer, $rescheduleTimeout) {
+            function ($err) use ($observer, $rescheduleTimeout): void {
                 $rescheduleTimeout();
                 $observer->onError($err);
             },
-            function () use ($observer, $rescheduleTimeout) {
+            function () use ($observer, $rescheduleTimeout): void {
                 $rescheduleTimeout();
                 $observer->onCompleted();
             }
diff --git a/src/Operator/TimestampOperator.php b/src/Operator/TimestampOperator.php
index 7dbddf2e..3dd6dac4 100644
--- a/src/Operator/TimestampOperator.php
+++ b/src/Operator/TimestampOperator.php
@@ -13,21 +13,18 @@
 
 final class TimestampOperator implements OperatorInterface
 {
-    private $scheduler;
-
-    public function __construct(SchedulerInterface $scheduler = null)
+    public function __construct(private readonly null|SchedulerInterface $scheduler = null)
     {
-        $this->scheduler = $scheduler;
     }
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         return $observable->subscribe(new CallbackObserver(
-            function ($x) use ($observer) {
+            function ($x) use ($observer): void {
                 $observer->onNext(new Timestamped($this->scheduler->now(), $x));
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()
         ));
     }
 }
diff --git a/src/Operator/ToArrayOperator.php b/src/Operator/ToArrayOperator.php
index 19c5acdc..07752712 100644
--- a/src/Operator/ToArrayOperator.php
+++ b/src/Operator/ToArrayOperator.php
@@ -11,17 +11,16 @@
 
 final class ToArrayOperator implements OperatorInterface
 {
-    /** @var array */
-    private $arr = [];
+    private array $arr = [];
 
     public function __invoke(ObservableInterface $observable, ObserverInterface $observer): DisposableInterface
     {
         $cbObserver = new CallbackObserver(
-            function ($x) {
+            function ($x): void {
                 $this->arr[] = $x;
             },
-            [$observer, 'onError'],
-            function () use ($observer) {
+            fn ($err) => $observer->onError($err),
+            function () use ($observer): void {
                 $observer->onNext($this->arr);
                 $observer->onCompleted();
             }
diff --git a/src/Operator/WithLatestFromOperator.php b/src/Operator/WithLatestFromOperator.php
index 5062fea4..6c3130bb 100644
--- a/src/Operator/WithLatestFromOperator.php
+++ b/src/Operator/WithLatestFromOperator.php
@@ -12,16 +12,13 @@
 
 final class WithLatestFromOperator implements OperatorInterface
 {
-    /** @var ObservableInterface[] */
-    private $observables;
-
-    /** @var callable */
-    private $resultSelector;
-
-    public function __construct(array $observables, callable $resultSelector = null)
-    {
+    public function __construct(
+        /** @var ObservableInterface[] */
+        private array $observables,
+        private null|\Closure $resultSelector = null
+    ) {
         if (null === $resultSelector) {
-            $resultSelector = function () {
+            $resultSelector = function (): array {
                 return func_get_args();
             };
         }
@@ -49,12 +46,12 @@ public function __invoke(ObservableInterface $source, ObserverInterface $observe
             $sad = new SingleAssignmentDisposable();
 
             $subscription = $o->subscribe(
-                function ($value) use ($key, &$values, $count, &$hasAllValues) {
+                function ($value) use ($key, &$values, $count, &$hasAllValues): void {
                     $values[$key] = $value;
                     $hasAllValues = $count === count($values);
                 },
-                [$observer, 'onError'],
-                function () {
+                fn ($err) => $observer->onError($err),
+                function (): void {
                     //noop
                 });
 
@@ -64,7 +61,7 @@ function () {
 
         $outerSad = new SingleAssignmentDisposable();
         $outerSad->setDisposable($source->subscribe(
-            function ($value) use ($observer, &$values, &$hasAllValues) {
+            function ($value) use ($observer, &$values, &$hasAllValues): void {
                 ksort($values);
                 $allValues = array_merge([$value], $values);
 
@@ -79,8 +76,8 @@ function ($value) use ($observer, &$values, &$hasAllValues) {
                     $observer->onError($ex);
                 }
             },
-            [$observer, 'onError'],
-            [$observer, 'onCompleted']));
+            fn ($err) => $observer->onError($err),
+            fn () => $observer->onCompleted()));
         $subscriptions[] = $outerSad;
 
         return new CompositeDisposable($subscriptions);
diff --git a/src/Operator/ZipOperator.php b/src/Operator/ZipOperator.php
index 674661bd..ffe8fea5 100644
--- a/src/Operator/ZipOperator.php
+++ b/src/Operator/ZipOperator.php
@@ -12,30 +12,21 @@
 
 final class ZipOperator implements OperatorInterface
 {
-    /** @var ObservableInterface[] */
-    private $sources;
-
-    /** @var callable */
-    private $resultSelector;
-
     /** @var \SplQueue[] */
-    private $queues = [];
-
-    /** @var int */
-    private $completesRemaining = 0;
-
-    /** @var int */
-    private $numberOfSources;
-
+    private array $queues = [];
+    private int $completesRemaining = 0;
+    private ?int $numberOfSources = null;
     /** @var bool[] */
-    private $completed = [];
+    private array $completed = [];
 
-    public function __construct(array $sources, callable $resultSelector = null)
-    {
-        $this->sources = $sources;
+    public function __construct(
+        /** @var ObservableInterface[] */
+        private array $sources,
+        private null|\Closure $resultSelector = null
+    ) {
 
         if ($resultSelector === null) {
-            $resultSelector = function () {
+            $resultSelector = function (): array {
                 return func_get_args();
             };
         }
@@ -61,7 +52,7 @@ public function __invoke(ObservableInterface $observable, ObserverInterface $obs
             $source = $this->sources[$i];
 
             $cbObserver = new CallbackObserver(
-                function ($x) use ($i, $observer) {
+                function ($x) use ($i, $observer): void {
                     // if there is another item in the sequence after one of the other source
                     // observables completes, we need to complete at this time to match the
                     // behavior of RxJS
@@ -94,10 +85,10 @@ function ($x) use ($i, $observer) {
                         $observer->onError($e);
                     }
                 },
-                function ($e) use ($observer) {
+                function ($e) use ($observer): void {
                     $observer->onError($e);
                 },
-                function () use ($i, $observer) {
+                function () use ($i, $observer): void {
                     $this->completesRemaining--;
                     $this->completed[$i] = true;
                     if ($this->completesRemaining === 0) {
diff --git a/src/React/Promise.php b/src/React/Promise.php
index bd384191..104e9fa0 100644
--- a/src/React/Promise.php
+++ b/src/React/Promise.php
@@ -39,28 +39,25 @@ public static function rejected($exception): ReactPromise
     /**
      * Converts an existing observable sequence to React Promise
      *
-     * @param ObservableInterface $observable
-     * @param Deferred $deferred
-     * @return ReactPromise
      * @throws \InvalidArgumentException
      */
     public static function fromObservable(ObservableInterface $observable, Deferred $deferred = null): ReactPromise
     {
 
-        $d = $deferred ?: new Deferred(function () use (&$subscription) {
+        $d = $deferred ?: new Deferred(function () use (&$subscription): void {
             $subscription->dispose();
         });
 
         $value = null;
 
         $subscription = $observable->subscribe(
-            function ($v) use (&$value) {
+            function ($v) use (&$value): void {
                 $value = $v;
             },
-            function ($error) use ($d) {
+            function ($error) use ($d): void {
                 $d->reject($error);
             },
-            function () use ($d, &$value) {
+            function () use ($d, &$value): void {
                 $d->resolve($value);
             }
         );
@@ -71,8 +68,6 @@ function () use ($d, &$value) {
     /**
      * Converts a Promise to an Observable sequence
      *
-     * @param PromiseInterface $promise
-     * @return Observable
      * @throws \InvalidArgumentException
      */
     public static function toObservable(PromiseInterface $promise): Observable
@@ -80,19 +75,19 @@ public static function toObservable(PromiseInterface $promise): Observable
         $subject = new AsyncSubject();
 
         $p = $promise->then(
-            function ($value) use ($subject) {
+            function ($value) use ($subject): void {
                 $subject->onNext($value);
                 $subject->onCompleted();
             },
-            function ($error) use ($subject) {
+            function ($error) use ($subject): void {
                 $error = $error instanceof \Throwable ? $error : new RejectedPromiseException($error);
                 $subject->onError($error);
             }
         );
 
-        return new AnonymousObservable(function ($observer) use ($subject, $p) {
+        return new AnonymousObservable(function ($observer) use ($subject, $p): \Rx\Disposable\CallbackDisposable {
             $disp = $subject->subscribe($observer);
-            return new CallbackDisposable(function () use ($p, $disp) {
+            return new CallbackDisposable(function () use ($p, $disp): void {
                 $disp->dispose();
                 if (\method_exists($p, 'cancel')) {
                     $p->cancel();
diff --git a/src/React/PromiseFactory.php b/src/React/PromiseFactory.php
index 7d7225ec..92482b5a 100644
--- a/src/React/PromiseFactory.php
+++ b/src/React/PromiseFactory.php
@@ -9,13 +9,11 @@ final class PromiseFactory
     /**
      * Returns an observable sequence that invokes the specified factory function whenever a new observer subscribes.
      *
-     * @param callable $factory
-     * @return Observable
      * @throws \InvalidArgumentException
      */
     public static function toObservable(callable $factory): Observable
     {
-        $observableFactory = function () use ($factory) {
+        $observableFactory = function () use ($factory): \Rx\Observable {
             return Promise::toObservable($factory());
         };
 
diff --git a/src/Scheduler.php b/src/Scheduler.php
index c37b672d..db51ec32 100644
--- a/src/Scheduler.php
+++ b/src/Scheduler.php
@@ -10,9 +10,9 @@ final class Scheduler
 {
     private static $default;
     private static $async;
-    private static $immediate;
-    private static $defaultFactory;
-    private static $asyncFactory;
+    private static null|ImmediateScheduler $immediate = null;
+    private static null|\Closure $defaultFactory = null;
+    private static null|\Closure $asyncFactory = null;
 
     public static function getDefault(): SchedulerInterface
     {
@@ -29,7 +29,7 @@ public static function getDefault(): SchedulerInterface
         return static::$default;
     }
 
-    public static function setDefaultFactory(callable $factory)
+    public static function setDefaultFactory(callable $factory): void
     {
         if (static::$default !== null) {
             throw new \Exception("The default factory can not be set after the scheduler has been created");
@@ -44,7 +44,7 @@ public static function getAsync(): AsyncSchedulerInterface
             return static::$async;
         }
 
-        if (static::$asyncFactory === null && static::getDefault() instanceof AsyncSchedulerInterface) {
+        if (static::$asyncFactory === null && self::getDefault() instanceof AsyncSchedulerInterface) {
             static::$async = static::$default;
             return static::$async;
         }
@@ -58,7 +58,7 @@ public static function getAsync(): AsyncSchedulerInterface
         return static::$async;
     }
 
-    public static function setAsyncFactory(callable $factory)
+    public static function setAsyncFactory(callable $factory): void
     {
         if (static::$async !== null) {
             throw new \Exception("The async factory can not be set after the scheduler has been created");
diff --git a/src/Scheduler/EventLoopScheduler.php b/src/Scheduler/EventLoopScheduler.php
index 98059a1b..3324c9d4 100644
--- a/src/Scheduler/EventLoopScheduler.php
+++ b/src/Scheduler/EventLoopScheduler.php
@@ -12,24 +12,20 @@
 
 final class EventLoopScheduler extends VirtualTimeScheduler
 {
-    private $nextTimer = PHP_INT_MAX;
+    private int $nextTimer = PHP_INT_MAX;
 
-    private $insideInvoke = false;
+    private bool $insideInvoke = false;
 
     private $delayCallback;
 
     private $currentTimer;
 
-    /**
-     * EventLoopScheduler constructor.
-     * @param callable|LoopInterface $timerCallableOrLoop
-     */
-    public function __construct($timerCallableOrLoop)
+    public function __construct(\Closure|LoopInterface $timerCallableOrLoop)
     {
         $this->delayCallback = $timerCallableOrLoop instanceof LoopInterface ?
-            function ($ms, $callable) use ($timerCallableOrLoop) {
+            function ($ms, $callable) use ($timerCallableOrLoop): CallbackDisposable {
                 $timer = $timerCallableOrLoop->addTimer($ms / 1000, $callable);
-                return new CallbackDisposable(function () use ($timer, $timerCallableOrLoop) {
+                return new CallbackDisposable(function () use ($timer, $timerCallableOrLoop): void {
                     $timerCallableOrLoop->cancelTimer($timer);
                 });
             } :
@@ -37,12 +33,12 @@ function ($ms, $callable) use ($timerCallableOrLoop) {
 
         $this->currentTimer = new EmptyDisposable();
 
-        parent::__construct($this->now(), function ($a, $b) {
+        parent::__construct($this->now(), function ($a, $b): int|float {
             return $a - $b;
         });
     }
 
-    private function scheduleStartup()
+    private function scheduleStartup(): void
     {
         if ($this->insideInvoke) {
             return;
@@ -56,7 +52,7 @@ public function scheduleAbsoluteWithState($state, int $dueTime, callable $action
     {
         $disp = new CompositeDisposable([
             parent::scheduleAbsoluteWithState($state, $dueTime, $action),
-            new CallbackDisposable(function () use ($dueTime) {
+            new CallbackDisposable(function () use ($dueTime): void {
                 if ($dueTime > $this->nextTimer) {
                     return;
                 }
@@ -77,7 +73,7 @@ public function scheduleAbsoluteWithState($state, int $dueTime, callable $action
         return $disp;
     }
 
-    public function start()
+    public function start(): void
     {
         $this->clock = $this->now();
 
diff --git a/src/Scheduler/ImmediateScheduler.php b/src/Scheduler/ImmediateScheduler.php
index 42278aca..39217d5c 100644
--- a/src/Scheduler/ImmediateScheduler.php
+++ b/src/Scheduler/ImmediateScheduler.php
@@ -28,11 +28,11 @@ public function scheduleRecursive(callable $action): DisposableInterface
         $goAgain    = true;
         $disposable = new CompositeDisposable();
 
-        $recursiveAction = function () use ($action, &$goAgain, $disposable) {
+        $recursiveAction = function () use ($action, &$goAgain, $disposable): void {
             while ($goAgain) {
                 $goAgain = false;
                 $disposable->add($this->schedule(function () use ($action, &$goAgain) {
-                    return $action(function () use (&$goAgain) {
+                    return $action(function () use (&$goAgain): void {
                         $goAgain = true;
                     });
                 }));
diff --git a/src/Scheduler/PriorityQueue.php b/src/Scheduler/PriorityQueue.php
index 88e8d9c8..7fe15986 100644
--- a/src/Scheduler/PriorityQueue.php
+++ b/src/Scheduler/PriorityQueue.php
@@ -9,14 +9,14 @@
 
 class PriorityQueue
 {
-    private $queue;
+    private InternalPriorityQueue $queue;
 
     public function __construct()
     {
         $this->queue = new InternalPriorityQueue;
     }
 
-    public function enqueue(ScheduledItem $item)
+    public function enqueue(ScheduledItem $item): void
     {
         $this->queue->insert($item, $item);
     }
@@ -48,7 +48,7 @@ public function remove($item)
         return $removed;
     }
 
-    public function count()
+    public function count(): int
     {
         return $this->queue->count();
     }
@@ -70,9 +70,9 @@ public function dequeue()
 class InternalPriorityQueue extends SplPriorityQueue
 {
     // use this value to "stabilize" the priority queue
-    private $serial = PHP_INT_MAX;
+    private int $serial = PHP_INT_MAX;
 
-    public function insert($item, $priority)
+    public function insert($item, $priority): void
     {
         parent::insert($item, [$priority, $this->serial--]);
     }
diff --git a/src/Scheduler/ScheduledItem.php b/src/Scheduler/ScheduledItem.php
index 5b8bcb79..a10ee831 100644
--- a/src/Scheduler/ScheduledItem.php
+++ b/src/Scheduler/ScheduledItem.php
@@ -8,26 +8,22 @@
 
 class ScheduledItem
 {
-    private $scheduler;
-    private $state;
-    private $action;
-    private $dueTime;
-    private $comparer;
-    private $disposable;
-
-    public function __construct($scheduler, $state, $action, $dueTime, $comparer = null)
-    {
-        $this->scheduler  = $scheduler;
-        $this->state      = $state;
-        $this->action     = $action;
-        $this->dueTime    = $dueTime;
-        $this->comparer   = $comparer ?: function ($a, $b) {
+    private SingleAssignmentDisposable $disposable;
+
+    public function __construct(
+        private $scheduler,
+        private $state,
+        private $action,
+        private $dueTime,
+        private null|\Closure $comparer = null
+    ) {
+        $this->comparer   = $comparer ?: function ($a, $b): int|float {
             return $a - $b;
         };
         $this->disposable = new SingleAssignmentDisposable();
     }
 
-    public function invoke()
+    public function invoke(): void
     {
         $this->disposable->setDisposable($this->invokeCore());
     }
diff --git a/src/Scheduler/VirtualTimeScheduler.php b/src/Scheduler/VirtualTimeScheduler.php
index 161723e2..cc2df279 100644
--- a/src/Scheduler/VirtualTimeScheduler.php
+++ b/src/Scheduler/VirtualTimeScheduler.php
@@ -12,26 +12,22 @@
 
 class VirtualTimeScheduler implements AsyncSchedulerInterface
 {
-    protected $clock;
-    protected $comparer;
-    protected $isEnabled = false;
-    protected $queue;
+    protected bool $isEnabled = false;
+    protected PriorityQueue $queue;
 
     /**
-     * @param integer $initialClock Initial value for the clock.
+     * @param integer $clock Initial value for the clock.
      * @param callable $comparer Comparer to determine causality of events based on absolute time.
      */
-    public function __construct(int $initialClock, callable $comparer)
+    public function __construct(protected int $clock, protected null|\Closure $comparer)
     {
-        $this->clock    = $initialClock;
-        $this->comparer = $comparer;
         $this->queue    = new PriorityQueue();
     }
 
     public function schedule(callable $action, $delay = 0): DisposableInterface
     {
 
-        $invokeAction = function ($scheduler, $action) {
+        $invokeAction = function ($scheduler, $action): \Rx\Disposable\EmptyDisposable {
             $action();
             return new EmptyDisposable();
         };
@@ -44,9 +40,9 @@ public function scheduleRecursive(callable $action): DisposableInterface
         $goAgain    = true;
         $disposable = new SerialDisposable();
 
-        $recursiveAction = function () use ($action, &$goAgain, $disposable, &$recursiveAction) {
-            $disposable->setDisposable($this->schedule(function () use ($action, &$recursiveAction) {
-                $action(function () use (&$recursiveAction) {
+        $recursiveAction = function () use ($action, &$goAgain, $disposable, &$recursiveAction): void {
+            $disposable->setDisposable($this->schedule(function () use ($action, &$recursiveAction): void {
+                $action(function () use (&$recursiveAction): void {
                     $recursiveAction();
                 });
             }));
@@ -64,7 +60,7 @@ public function getClock(): int
 
     public function scheduleAbsolute(int $dueTime, $action): DisposableInterface
     {
-        $invokeAction = function ($scheduler, $action) {
+        $invokeAction = function ($scheduler, $action): \Rx\Disposable\EmptyDisposable {
             $action();
             return new EmptyDisposable();
         };
@@ -88,13 +84,13 @@ public function scheduleAbsoluteWithState($state, int $dueTime, callable $action
 
         $this->queue->enqueue($scheduledItem);
 
-        return new CallbackDisposable(function () use ($scheduledItem) {
+        return new CallbackDisposable(function () use ($scheduledItem): void {
             $scheduledItem->getDisposable()->dispose();
             $this->queue->remove($scheduledItem);
         });
     }
 
-    public function scheduleRelativeWithState($state, $dueTime, $action): DisposableInterface
+    public function scheduleRelativeWithState($state, $dueTime, callable $action): DisposableInterface
     {
         $runAt = $this->now() + $dueTime;
 
@@ -112,7 +108,7 @@ public function schedulePeriodic(callable $action, $delay, $period): DisposableI
 
         $disposable = new SerialDisposable();
 
-        $doActionAndReschedule = function () use (&$nextTime, $period, $disposable, $action, &$doActionAndReschedule) {
+        $doActionAndReschedule = function () use (&$nextTime, $period, $disposable, $action, &$doActionAndReschedule): void {
             $action();
             $nextTime += $period;
             $delay = $nextTime - $this->now();
@@ -127,7 +123,7 @@ public function schedulePeriodic(callable $action, $delay, $period): DisposableI
         return $disposable;
     }
 
-    public function start()
+    public function start(): void
     {
         if (!$this->isEnabled) {
 
diff --git a/src/SchedulerInterface.php b/src/SchedulerInterface.php
index 4ebbbcb3..4d70c929 100644
--- a/src/SchedulerInterface.php
+++ b/src/SchedulerInterface.php
@@ -7,33 +7,23 @@
 interface SchedulerInterface
 {
     /**
-     * @param callable $action
      * @param $delay
      *
-     * @return DisposableInterface
      */
     public function schedule(callable $action, $delay = 0): DisposableInterface;
 
-    /**
-     * @param callable $action
-     *
-     * @return DisposableInterface
-     */
+    
     public function scheduleRecursive(callable $action): DisposableInterface;
 
     /**
-     * @param callable $action
      * @param int $delay
      * @param $period
      *
-     * @return mixed
      */
     public function schedulePeriodic(callable $action, $delay, $period): DisposableInterface;
 
     /**
      * Gets the current representation of now for the scheduler
-     *
-     * @return mixed
      */
     public function now(): int;
 }
diff --git a/src/Subject/AsyncSubject.php b/src/Subject/AsyncSubject.php
index ef3200cc..eb37bb8a 100644
--- a/src/Subject/AsyncSubject.php
+++ b/src/Subject/AsyncSubject.php
@@ -8,37 +8,19 @@
 use Rx\DisposableInterface;
 use Rx\ObserverInterface;
 
-/**
- * Class AsyncSubject
- * @package Rx\Subject
- */
 class AsyncSubject extends Subject
 {
-    /**
-     * @var
-     */
     private $value;
 
+    private bool $valueSet = false;
 
-    /**
-     * @var bool
-     */
-    private $valueSet = false;
-
-    /**
-     * @return mixed
-     */
-    public function getValue()
+    public function getValue(): mixed
     {
         return $this->value;
     }
 
-    /**
-     * @param $value
-     */
-    public function onNext($value)
+    public function onNext($value): void
     {
-
         $this->assertNotDisposed();
 
         if ($this->isStopped) {
@@ -49,7 +31,7 @@ public function onNext($value)
         $this->valueSet = true;
     }
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         if ($this->valueSet) {
             parent::onNext($this->value);
@@ -84,7 +66,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
 
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         parent::dispose();
 
diff --git a/src/Subject/BehaviorSubject.php b/src/Subject/BehaviorSubject.php
index 4729b75f..433c4b2b 100644
--- a/src/Subject/BehaviorSubject.php
+++ b/src/Subject/BehaviorSubject.php
@@ -21,7 +21,7 @@ public function getValue()
         return $this->value;
     }
 
-    public function onNext($value)
+    public function onNext($value): void
     {
         $this->value = $value;
 
@@ -37,7 +37,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
         return $disposable;
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         parent::dispose();
 
diff --git a/src/Subject/InnerSubscriptionDisposable.php b/src/Subject/InnerSubscriptionDisposable.php
index ccea81d7..00e32afc 100644
--- a/src/Subject/InnerSubscriptionDisposable.php
+++ b/src/Subject/InnerSubscriptionDisposable.php
@@ -9,16 +9,13 @@
 
 class InnerSubscriptionDisposable implements DisposableInterface
 {
-    private $observer;
-    private $subject;
-
-    public function __construct(Subject $subject, ObserverInterface $observer)
-    {
-        $this->subject  = $subject;
-        $this->observer = $observer;
+    public function __construct(
+        private readonly Subject $subject,
+        private null|ObserverInterface $observer
+    ) {
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         if ($this->subject->isDisposed()) {
             return;
diff --git a/src/Subject/ReplaySubject.php b/src/Subject/ReplaySubject.php
index e0ac85d8..633cf268 100644
--- a/src/Subject/ReplaySubject.php
+++ b/src/Subject/ReplaySubject.php
@@ -17,23 +17,17 @@
  */
 class ReplaySubject extends Subject
 {
-    /** @var int */
-    private $bufferSize;
+    private ?int $bufferSize;
 
-    /** @var int */
-    private $windowSize;
+    private ?int $windowSize;
 
-    /** @var array */
-    private $queue = [];
+    private array $queue = [];
 
-    /** @var int */
-    private $maxSafeInt = PHP_INT_MAX;
+    private int $maxSafeInt = PHP_INT_MAX;
 
-    /** @var bool */
-    private $hasError = false;
+    private bool $hasError = false;
 
-    /** @var SchedulerInterface */
-    private $scheduler;
+    private \Rx\SchedulerInterface $scheduler;
 
     public function __construct(int $bufferSize = null, int $windowSize = null, SchedulerInterface $scheduler = null)
     {
@@ -70,10 +64,8 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
 
         if ($this->hasError) {
             $so->onError($this->exception);
-        } else {
-            if ($this->isStopped) {
-                $so->onCompleted();
-            }
+        } elseif ($this->isStopped) {
+            $so->onCompleted();
         }
 
         $so->ensureActive();
@@ -81,7 +73,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
         return $subscription;
     }
 
-    public function onNext($value)
+    public function onNext($value): void
     {
         $this->assertNotDisposed();
 
@@ -102,7 +94,7 @@ public function onNext($value)
 
     }
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         $this->assertNotDisposed();
 
@@ -121,7 +113,7 @@ public function onCompleted()
         $this->observers = [];
     }
 
-    public function onError(\Throwable $exception)
+    public function onError(\Throwable $exception): void
     {
         $this->assertNotDisposed();
 
@@ -144,9 +136,9 @@ public function onError(\Throwable $exception)
         $this->observers = [];
     }
 
-    private function createRemovableDisposable($subject, $observer): DisposableInterface
+    private function createRemovableDisposable(self $subject, \Rx\Observer\ScheduledObserver $observer): DisposableInterface
     {
-        return new CallbackDisposable(function () use ($observer, $subject) {
+        return new CallbackDisposable(function () use ($observer, $subject): void {
             $observer->dispose();
             if (!$subject->isDisposed()) {
                 array_splice($subject->observers, (int)array_search($observer, $subject->observers, true), 1);
@@ -154,7 +146,7 @@ private function createRemovableDisposable($subject, $observer): DisposableInter
         });
     }
 
-    private function trim()
+    private function trim(): void
     {
         if (count($this->queue) > $this->bufferSize) {
             array_shift($this->queue);
diff --git a/src/Subject/Subject.php b/src/Subject/Subject.php
index f5e2cdcb..cf53ee20 100644
--- a/src/Subject/Subject.php
+++ b/src/Subject/Subject.php
@@ -43,7 +43,7 @@ public function isDisposed()
         return $this->isDisposed;
     }
 
-    public function hasObservers()
+    public function hasObservers(): bool
     {
         return count($this->observers) > 0;
     }
@@ -55,7 +55,7 @@ protected function assertNotDisposed()
         }
     }
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         $this->assertNotDisposed();
 
@@ -73,7 +73,7 @@ public function onCompleted()
         $this->observers = [];
     }
 
-    public function onError(\Throwable $exception)
+    public function onError(\Throwable $exception): void
     {
         $this->assertNotDisposed();
 
@@ -92,7 +92,7 @@ public function onError(\Throwable $exception)
         $this->observers = [];
     }
 
-    public function onNext($value)
+    public function onNext($value): void
     {
         $this->assertNotDisposed();
 
@@ -106,7 +106,7 @@ public function onNext($value)
         }
     }
 
-    public function dispose()
+    public function dispose(): void
     {
         $this->isDisposed = true;
         $this->observers  = [];
diff --git a/src/Testing/ColdObservable.php b/src/Testing/ColdObservable.php
index fce41240..17c51ce7 100644
--- a/src/Testing/ColdObservable.php
+++ b/src/Testing/ColdObservable.php
@@ -14,14 +14,11 @@
 
 class ColdObservable extends Observable
 {
-    private $scheduler;
-    private $messages;
-    private $subscriptions = [];
-
-    public function __construct(TestScheduler $scheduler, array $messages = [])
-    {
-        $this->scheduler = $scheduler;
-        $this->messages  = $messages;
+    public function __construct(
+        private readonly TestScheduler $scheduler,
+        private readonly array         $messages = [],
+        private array                  $subscriptions = []
+    ) {
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -38,11 +35,9 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
             $notification = $message->getValue();
             $time         = $message->getTime();
 
-            $schedule = function (Notification $innerNotification) use (&$disposable, &$currentObservable, $observer, $scheduler, $time, &$isDisposed) {
-                $disposable->add($scheduler->scheduleRelativeWithState(null, $time, function () use ($observer, $innerNotification, &$isDisposed) {
-                    if (!$isDisposed) {
-                        $innerNotification->accept($observer);
-                    }
+            $schedule = function (Notification $innerNotification) use (&$disposable, &$currentObservable, $observer, $scheduler, $time, &$isDisposed): void {
+                $disposable->add($scheduler->scheduleRelativeWithState(null, $time, function () use ($observer, $innerNotification, &$isDisposed): \Rx\Disposable\EmptyDisposable {
+                    $innerNotification->accept($observer);
                     return new EmptyDisposable();
                 }));
             };
@@ -52,7 +47,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
 
         $subscriptions = &$this->subscriptions;
 
-        return new CallbackDisposable(function () use (&$currentObservable, $index, $observer, $scheduler, &$subscriptions, &$isDisposed) {
+        return new CallbackDisposable(function () use (&$currentObservable, $index, $observer, $scheduler, &$subscriptions, &$isDisposed): void {
             $isDisposed            = true;
             $subscriptions[$index] = new Subscription($subscriptions[$index]->getSubscribed(), $scheduler->getClock());
         });
diff --git a/src/Testing/HotObservable.php b/src/Testing/HotObservable.php
index a86bdfed..1714b3e3 100644
--- a/src/Testing/HotObservable.php
+++ b/src/Testing/HotObservable.php
@@ -13,23 +13,20 @@
 
 class HotObservable extends Observable
 {
-    private $scheduler;
-    private $messages;
-    private $subscriptions = [];
-    private $observers = [];
+    private array $subscriptions = [];
+    private array $observers = [];
 
-    public function __construct(TestScheduler $scheduler, array $messages)
+    public function __construct(private TestScheduler $scheduler, array $messages)
     {
         $this->scheduler   = $scheduler;
-        $this->messages    = $messages;
         $currentObservable = $this;
 
         foreach ($messages as $message) {
             $time         = $message->getTime();
             $notification = $message->getValue();
 
-            $schedule = function (Notification $innerNotification) use (&$currentObservable, $scheduler, $time) {
-                $scheduler->scheduleAbsolute($time, function () use (&$currentObservable, $innerNotification) {
+            $schedule = function (Notification $innerNotification) use (&$currentObservable, $scheduler, $time): void {
+                $scheduler->scheduleAbsolute($time, function () use (&$currentObservable, $innerNotification): \Rx\Disposable\EmptyDisposable {
                     $observers = $currentObservable->getObservers();
 
                     foreach ($observers as $observer) {
@@ -56,7 +53,7 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
         $index     = count($this->subscriptions) - 1;
         $scheduler = $this->scheduler;
 
-        return new CallbackDisposable(function () use (&$currentObservable, $index, $observer, $scheduler, &$subscriptions) {
+        return new CallbackDisposable(function () use (&$currentObservable, $index, $observer, $scheduler, &$subscriptions): void {
             $currentObservable->removeObserver($observer);
             $subscriptions[$index] = new Subscription($subscriptions[$index]->getSubscribed(), $scheduler->getClock());
         });
diff --git a/src/Testing/MockObserver.php b/src/Testing/MockObserver.php
index a30a050c..5fc685c2 100644
--- a/src/Testing/MockObserver.php
+++ b/src/Testing/MockObserver.php
@@ -14,15 +14,13 @@
  */
 class MockObserver implements ObserverInterface
 {
-    private $scheduler;
-    private $messages = [];
+    private array $messages = [];
 
-    public function __construct(TestScheduler $scheduler)
+    public function __construct(private readonly TestScheduler $scheduler)
     {
-        $this->scheduler = $scheduler;
     }
 
-    public function onNext($value)
+    public function onNext($value): void
     {
         $this->messages[] = new Recorded(
             $this->scheduler->getClock(),
@@ -30,7 +28,7 @@ public function onNext($value)
         );
     }
 
-    public function onError(\Throwable $error)
+    public function onError(\Throwable $error): void
     {
         $this->messages[] = new Recorded(
             $this->scheduler->getClock(),
@@ -38,7 +36,7 @@ public function onError(\Throwable $error)
         );
     }
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         $this->messages[] = new Recorded(
             $this->scheduler->getClock(),
@@ -46,7 +44,7 @@ public function onCompleted()
         );
     }
 
-    public function getMessages()
+    public function getMessages(): array
     {
         return $this->messages;
     }
diff --git a/src/Testing/Recorded.php b/src/Testing/Recorded.php
index 50356d7b..82a372e4 100644
--- a/src/Testing/Recorded.php
+++ b/src/Testing/Recorded.php
@@ -6,14 +6,11 @@
 
 class Recorded
 {
-    private $time;
-    private $value;
-    private $comparer;
-
-    public function __construct(int $time, $value, callable $comparer = null)
-    {
-        $this->time     = $time;
-        $this->value    = $value;
+    public function __construct(
+        private int $time,
+        private $value,
+        private null|\Closure $comparer = null
+    ) {
         $this->comparer = $comparer ?: function ($a, $b) {
             if (is_object($a) && method_exists($a, 'equals')) {
                 return $a->equals($b);
@@ -23,7 +20,7 @@ public function __construct(int $time, $value, callable $comparer = null)
         };
     }
 
-    public function equals(Recorded $other)
+    public function equals(Recorded $other): bool
     {
         $comparer = $this->comparer;
 
@@ -31,7 +28,7 @@ public function equals(Recorded $other)
             && $comparer($this->value, $other->value);
     }
 
-    public function __toString()
+    public function __toString(): string
     {
         return $this->value . '@' . $this->time;
     }
diff --git a/src/Testing/Subscription.php b/src/Testing/Subscription.php
index c6915e2d..3f61f55f 100644
--- a/src/Testing/Subscription.php
+++ b/src/Testing/Subscription.php
@@ -6,8 +6,8 @@
 
 class Subscription
 {
-    private $subscribed;
-    private $unsubscribed;
+    private int $subscribed;
+    private int $unsubscribed;
 
     public function __construct(int $start, int $end = PHP_INT_MAX)
     {
@@ -15,23 +15,23 @@ public function __construct(int $start, int $end = PHP_INT_MAX)
         $this->unsubscribed = $end;
     }
 
-    public function equals(Subscription $other)
+    public function equals(Subscription $other): bool
     {
         return $this->subscribed === $other->subscribed
             && $this->unsubscribed === $other->unsubscribed;
     }
 
-    public function getSubscribed()
+    public function getSubscribed(): int
     {
         return $this->subscribed;
     }
 
-    public function getUnsubscribed()
+    public function getUnsubscribed(): int
     {
         return $this->unsubscribed;
     }
 
-    public function __toString()
+    public function __toString(): string
     {
         $end = $this->unsubscribed === PHP_INT_MAX ? 'Infinite' : $this->unsubscribed;
         return "Subscription({$this->subscribed}, {$end})";
diff --git a/src/Testing/TestScheduler.php b/src/Testing/TestScheduler.php
index 4d7312b6..f4eee948 100644
--- a/src/Testing/TestScheduler.php
+++ b/src/Testing/TestScheduler.php
@@ -18,7 +18,7 @@ class TestScheduler extends VirtualTimeScheduler
 
     public function __construct()
     {
-        parent::__construct(0, function ($a, $b) {
+        parent::__construct(0, function ($a, $b): int|float {
             return $a - $b;
         });
     }
@@ -42,25 +42,25 @@ public function startWithDispose($create, $disposed): MockObserver
         return $this->startWithTiming($create, self::CREATED, self::SUBSCRIBED, $disposed);
     }
 
-    public function startWithTiming($create, $created = self::CREATED, $subscribed = self::SUBSCRIBED, $disposed = self::DISPOSED): ObserverInterface
+    public function startWithTiming($create, int $created = self::CREATED, int $subscribed = self::SUBSCRIBED, int $disposed = self::DISPOSED): ObserverInterface
     {
         $observer     = new MockObserver($this);
         $source       = null;
         $subscription = null;
 
-        $this->scheduleAbsoluteWithState(null, $created, function () use ($create, &$source) {
+        $this->scheduleAbsoluteWithState(null, $created, function () use ($create, &$source): \Rx\Disposable\EmptyDisposable {
             $source = $create();
 
             return new EmptyDisposable();
         });
 
-        $this->scheduleAbsoluteWithState(null, $subscribed, function () use (&$observer, &$source, &$subscription) {
+        $this->scheduleAbsoluteWithState(null, $subscribed, function () use (&$observer, &$source, &$subscription): \Rx\Disposable\EmptyDisposable {
             $subscription = $source->subscribe($observer);
 
             return new EmptyDisposable();
         });
 
-        $this->scheduleAbsoluteWithState(null, $disposed, function () use (&$subscription) {
+        $this->scheduleAbsoluteWithState(null, $disposed, function () use (&$subscription): \Rx\Disposable\EmptyDisposable {
             $subscription->dispose();
 
             return new EmptyDisposable();
diff --git a/src/Testing/TestSubject.php b/src/Testing/TestSubject.php
index 9be8929f..7f99042f 100644
--- a/src/Testing/TestSubject.php
+++ b/src/Testing/TestSubject.php
@@ -9,24 +9,17 @@
 use Rx\ObserverInterface;
 use Rx\Subject\Subject;
 
-/**
- * Class TestSubject
- * @package Rx\Testing
- */
 class TestSubject extends Subject
 {
-    /** @var int */
-    private $subscribeCount;
+    private int $subscribeCount = 0;
 
-    /** @var  ObserverInterface */
-    private $observer;
+    private ?\Rx\ObserverInterface $observer = null;
 
     /* @var DisposableInterface[] */
-    private $disposeOnMap;
+    private ?array $disposeOnMap = null;
 
     public function __construct()
     {
-        $this->subscribeCount = 0;
     }
 
     protected function _subscribe(ObserverInterface $observer): DisposableInterface
@@ -35,25 +28,18 @@ protected function _subscribe(ObserverInterface $observer): DisposableInterface
         $this->subscribeCount++;
         $this->observer = $observer;
 
-        return new CallbackDisposable(function () {
+        return new CallbackDisposable(function (): void {
             $this->dispose();
         });
 
     }
 
-    /**
-     * @param $value
-     * @param $disposable
-     */
-    public function disposeOn($value, DisposableInterface $disposable)
+    public function disposeOn($value, DisposableInterface $disposable): void
     {
         $this->disposeOnMap[$value] = $disposable;
     }
 
-    /**
-     * @param $value
-     */
-    public function onNext($value)
+    public function onNext($value): void
     {
         $this->observer->onNext($value);
         if (isset($this->disposeOnMap[$value])) {
@@ -61,22 +47,16 @@ public function onNext($value)
         }
     }
 
-    /**
-     * @param \Throwable $exception
-     */
-    public function onError(\Throwable $exception)
+    public function onError(\Throwable $exception): void
     {
         $this->observer->onError($exception);
     }
 
-    public function onCompleted()
+    public function onCompleted(): void
     {
         $this->observer->onCompleted();
     }
 
-    /**
-     * @return int
-     */
     public function getSubscribeCount(): int
     {
         return $this->subscribeCount;
diff --git a/src/Timestamped.php b/src/Timestamped.php
index baa99f8b..e9768c56 100644
--- a/src/Timestamped.php
+++ b/src/Timestamped.php
@@ -38,11 +38,7 @@ public function equals($other)
         if (is_scalar($this->value) && $this->value == $other->value) {
             return true;
         }
-        if ($this->value === $other->value) {
-            return true;
-        }
-        
-        return false;
+        return $this->value === $other->value;
     }
 
     /**