Add comparer nullable parameters signature in DropInGenerator

Author: neuecc

sandbox/ConsoleApp/Program.cs

@@ -29,12 +29,13 @@
 //var tako = ValueEnumerable.Range(1, 10).Select(x => x.ToString());
 //var ok = string.Join(',', tako);
 
+string[]? source = [];
 
-IEnumerable<int> source = ForceNotCollection([1, 2, 3, 4, 5]);
+// ZLinq
+source.AsValueEnumerable().Order(comparer: null); // No warning
 
-var values = source.AsValueEnumerable().Take(^5..3); // 1,2,3
-var a = values.ToArray();
-var b = values.ToArray();
+// ZLinq (with Drop-in replacement)
+source.Order(comparer: null);
 
 
 static IEnumerable<T> ForceNotCollection<T>(IEnumerable<T> source)

src/FileGen/DropIn/Array.cs

@@ -219,7 +219,13 @@ string BuildType(MethodInfo methodInfo, Type type, string replacement)
 
         var sb = new StringBuilder();
         BuildTypeCore(sb, type, replacement);
-        return sb.ToString();
+
+        var str = sb.ToString();
+        if (str.Contains("IComparer") || str.Contains("IEqualityComparer"))
+        {
+            str = str + "?";
+        }
+        return str;
     }
 
     void BuildTypeCore(StringBuilder builder, Type type, string replacement)

src/FileGen/DropIn/IEnumerable.cs

@@ -23,7 +23,7 @@ public static ValueEnumerable<GroupBy2<TEnumerator, TSource, TKey, TElement>, IG
 #endif
             => new(new(source.Enumerator, Throws.IfNull(keySelector), Throws.IfNull(elementSelector), null));
 
-        public static ValueEnumerable<GroupBy2<TEnumerator, TSource, TKey, TElement>, IGrouping<TKey, TElement>> GroupBy<TEnumerator, TSource, TKey, TElement>(this ValueEnumerable<TEnumerator, TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer)
+        public static ValueEnumerable<GroupBy2<TEnumerator, TSource, TKey, TElement>, IGrouping<TKey, TElement>> GroupBy<TEnumerator, TSource, TKey, TElement>(this ValueEnumerable<TEnumerator, TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey>? comparer)
             where TEnumerator : struct, IValueEnumerator<TSource>
 #if NET9_0_OR_GREATER
             , allows ref struct
@@ -37,7 +37,7 @@ public static ValueEnumerable<GroupBy3<TEnumerator, TSource, TKey, TResult>, TRe
 #endif
             => new(new(source.Enumerator, Throws.IfNull(keySelector), Throws.IfNull(resultSelector), null));
 
-        public static ValueEnumerable<GroupBy3<TEnumerator, TSource, TKey, TResult>, TResult> GroupBy<TEnumerator, TSource, TKey, TResult>(this ValueEnumerable<TEnumerator, TSource> source, Func<TSource, TKey> keySelector, Func<TKey, IEnumerable<TSource>, TResult> resultSelector, IEqualityComparer<TKey> comparer)
+        public static ValueEnumerable<GroupBy3<TEnumerator, TSource, TKey, TResult>, TResult> GroupBy<TEnumerator, TSource, TKey, TResult>(this ValueEnumerable<TEnumerator, TSource> source, Func<TSource, TKey> keySelector, Func<TKey, IEnumerable<TSource>, TResult> resultSelector, IEqualityComparer<TKey>? comparer)
             where TEnumerator : struct, IValueEnumerator<TSource>
 #if NET9_0_OR_GREATER
             , allows ref struct
@@ -51,7 +51,7 @@ public static ValueEnumerable<GroupBy4<TEnumerator, TSource, TKey, TElement, TRe
 #endif
             => new(new(source.Enumerator, Throws.IfNull(keySelector), Throws.IfNull(elementSelector), Throws.IfNull(resultSelector), null));
 
-        public static ValueEnumerable<GroupBy4<TEnumerator, TSource, TKey, TElement, TResult>, TResult> GroupBy<TEnumerator, TSource, TKey, TElement, TResult>(this ValueEnumerable<TEnumerator, TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, Func<TKey, IEnumerable<TElement>, TResult> resultSelector, IEqualityComparer<TKey> comparer)
+        public static ValueEnumerable<GroupBy4<TEnumerator, TSource, TKey, TElement, TResult>, TResult> GroupBy<TEnumerator, TSource, TKey, TElement, TResult>(this ValueEnumerable<TEnumerator, TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, Func<TKey, IEnumerable<TElement>, TResult> resultSelector, IEqualityComparer<TKey>? comparer)
             where TEnumerator : struct, IValueEnumerator<TSource>
 #if NET9_0_OR_GREATER
             , allows ref struct