Prepare changelog for 0.12.1.0 (#658)

* WIP: Prepare changelog for 0.12.1.0

* fiddle with CI

* Revert "fiddle with CI"

This reverts commit 3e22005.

* More changelog updates

* Mention `pure-haskell` flag in Changelog.md

* Add hidden entry for #660

Changelog.md

@@ -1,3 +1,65 @@
+[0.13.0.0] — circa 2026-2027
+
+* __Breaking Changes__:
+  * [`Data.Data.dataTypeOf` for `StrictByteString` and `LazyByteString` now returns a `DataType` that uses `AlgRep` instead of `NoRep`.](https://github.com/haskell/bytestring/pull/614)
+    * This allows utilities like `syb:Data.Generics.Text.gread` to be meaningfully used at these types containing `ByteString`s.
+<!--
+* Bug fixes:
+* API additions and behavior changes:
+* Deprecations:
+* Performance improvements:
+* Miscellaneous:
+* Internal stuff:
+-->
+
+[0.12.1.0] — February 2024
+
+* [Provisional support has been added for using `bytestring` with GHC's JavaScript back-end.](https://github.com/haskell/bytestring/pull/631)
+  * This support is relatively un-tested and un-optimised. There may be bugs! Please report any you discover to [`bytestring`'s issue tracker](https://github.com/haskell/bytestring/issues).
+  * The JavaScript back-end's limited support for the Haskell-C foreign function interface would previously result in many operations failing with errors like `ReferenceError: h$fps_count is not defined`.
+  * The new `pure-haskell` package flag allows the new fallback Haskell implementations (used to support the JavaScript backend) to be used on most other platforms as well.
+* Bug fixes:
+  * [`stimes 0 sbs :: ShortByteString` now returns the empty `ShortByteString` instead of throwing an exception](https://github.com/haskell/bytestring/pull/611)
+  * [`stimes 0 b :: Builder` now returns the empty `Builder` instead of throwing an exception](https://github.com/haskell/bytestring/pull/611)
+  * [Several alignment-related bug fixes](https://github.com/haskell/bytestring/pull/587)
+  * [Fix a bug in `isValidUtf8`](https://github.com/haskell/bytestring/pull/621)
+  * [`sconcat @ShortByteString` is no longer terribly inefficient](https://github.com/haskell/bytestring/pull/650)
+  * [Fix the type on the foreign import used for `Data.ByteString.Short.elemIndex`](https://github.com/haskell/bytestring/pull/661)
+  * [Ensure that the result of `fromShort` is protected by `mkDeferredByteString`](https://github.com/haskell/bytestring/pull/662)
+* Behavior changes:
+  * [The `Data.Data.Data` instances for `StrictByteString` and `LazyByteString` have been changed:](https://github.com/haskell/bytestring/pull/614)
+    * `toConstr` now returns the a `pack` pseudo-constructor instead of throwing an exception.
+    * Due to this pseudo-constructor, `gunfold` can now be meaningfully used at these types. (Previously, it would always raise an exception.)
+    * These changes allow `syb:Data.Generics.Text.gshow` to be meaningfully used at types containing `ByteString`s.
+  * [A derived `instance Generic ShortByteString` has been added.](https://github.com/haskell/bytestring/pull/662)
+  * [`sconcat @Builder` is now lazy in the tail of its input](https://github.com/haskell/bytestring/pull/650)
+* Deprecations:
+  * [`Data.ByteString.Builder.Prim.Internal.storableToF`](https://github.com/haskell/bytestring/pull/649)
+* Performance improvements:
+  * Various raw-binary `Builder` primitives like `intHost` or `word32BE` are much less inefficient on architectures not known to support unaligned writes. ([1](https://github.com/haskell/bytestring/pull/587), [2](https://github.com/haskell/bytestring/pull/645))
+  * [Hexadecimal encoding suffers one indirection fewer](https://github.com/haskell/bytestring/pull/624)
+  * [`Data.ByteString.Lazy.takeEnd` is somewhat faster](https://github.com/haskell/bytestring/pull/629)
+  * [`Data.ByteString.Lazy.dropEnd` is much faster](https://github.com/haskell/bytestring/pull/629)
+* Miscellaneous:
+  * Various documentation improvements ([1](https://github.com/haskell/bytestring/pull/628), [2](https://github.com/haskell/bytestring/pull/609), [3](https://github.com/haskell/bytestring/pull/612), [4](https://github.com/haskell/bytestring/pull/623), [5](https://github.com/haskell/bytestring/pull/654))
+  * [Eta-expand `Data.ByteString.Builder.Internal.empty`](https://github.com/haskell/bytestring/pull/616)
+    * This can variously help or hurt performance; it undoes the performance changes caused by [CLC proposal 132](https://github.com/haskell/core-libraries-committee/issues/132) with ghc-9.8 and restores the baseline performance seen with older GHCs.
+<!--
+* Internal stuff:
+  * [Delete cabal.project](https://github.com/haskell/bytestring/pull/613)
+  * Remove some non-exposed data declarations from internal modules:
+    * [`Data.ByteString.Short.Internal.BA`](https://github.com/haskell/bytestring/pull/615)
+    * [`Data.ByteString.Short.Internal.MBA`](https://github.com/haskell/bytestring/pull/617)
+  * Various CI tweaks ([1](https://github.com/haskell/bytestring/pull/626), [2](https://github.com/haskell/bytestring/pull/651))
+  * [Use `NonEmpty` to prune dead code in `integerDec`](https://github.com/haskell/bytestring/pull/655)
+    * This might have a performance impact due to result unboxing (CPR).
+  * [Consolidate internal CPP for byte-order/endianness](https://github.com/haskell/bytestring/pull/659)
+  * [Remove remaining uses of FFI under -fpure-haskell](https://github.com/haskell/bytestring/pull/660)
+    * Doesn't warrant a separate visible changelog entry from #631.
+-->
+
+[0.12.1.0]: https://github.com/haskell/bytestring/compare/0.12.0.2...0.12.1.0
+
 [0.12.0.2] — August 2023
 
 * Bug fixes:
@@ -36,11 +98,6 @@
 * Deprecations:
   * `Data.ByteString.getLine`: prefer `Data.ByteString.Char8.getLine`
   * `Data.ByteString.hGetLine`: prefer `Data.ByteString.Char8.hGetLine`
-<!--
-* Performance improvements:
-* Miscellaneous:
-* Internal stuff:
--->
 
 
 [0.12.0.0]: https://github.com/haskell/bytestring/compare/0.11.5.0...0.12.0.0

bytestring.cabal

@@ -1,5 +1,5 @@
 Name:                bytestring
-Version:             0.12.0.2
+Version:             0.13.0.0
 Synopsis:            Fast, compact, strict and lazy byte strings with a list interface
 Description:
     An efficient compact, immutable byte string type (both strict and lazy)