Announcements
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.
Compiler
* Implement a retain_options flag in protoc. (https://github.com/protocolbuffers/protobuf/commit/83507c7f4e8a53cc6e800efac5ce157cd960f657)
* Make protoc --descriptor_set_out respect option retention (https://github.com/protocolbuffers/protobuf/commit/ae2531dcc2492c51554ea36d15540ff816ca6abd)
* Modify release artifacts for protoc to statically link system libraries. (https://github.com/protocolbuffers/protobuf/commit/723bd4c3c1a51ccf7e9726453f0b710223c4b583)
* Extension declaration: Enforce that if the extension range has a declaration then all extensions in that range must be declared. This should prevent non-declared extensions from being added. (https://github.com/protocolbuffers/protobuf/commit/5dc171f71eca66579b06d4400ee5c94bfa68947a)
* Implement "reserved" for extension declaration. (https://github.com/protocolbuffers/protobuf/commit/41287bd5d5373e91277b849e93c7ae2a0238b5c3)
* Open-source extension declaration definition. (https://github.com/protocolbuffers/protobuf/commit/145900f06c732974af996a28a3e2c211ae104888)
C++
* Fix(libprotoc): export useful symbols from .so (https://github.com/protocolbuffers/protobuf/commit/46fb4aa8d2ade5e0067fce271fcb5293c5c70500)
* Turn off clang::musttail on i386 (https://github.com/protocolbuffers/protobuf/commit/b40633ff0bf9b34bf3bec9f3d35eec2d951a98b8)
* Fixes Clang 6 linker bug (https://github.com/protocolbuffers/protobuf/commit/49bb3f20647b914fc52909eec19f260fb9a945f3)
* Remove PROTOBUF_DEPRECATED in favor of [[deprecated]]. (https://github.com/protocolbuffers/protobuf/commit/5c59290022dcbbea71099bc40097a149a2446f21)
* Add `assert` to the list of keywords for C++. (https://github.com/protocolbuffers/protobuf/commit/a75c1a2761e49d8afb7838c03b923b909420f7fd)
* Added Reflection::GetCord() method in C++ (https://github.com/protocolbuffers/protobuf/commit/6ecb5d097e8d9bfafeb5ec8d251827f0d444f2ce)
* Support C++ protobuf ctype=CORD for bytes field (generated code). (https://github.com/protocolbuffers/protobuf/commit/714f97502662ae75ed64f8456b43d5536740b022)
* Expand LazySerializerEmitter to cover proto3 cases. (https://github.com/protocolbuffers/protobuf/commit/fab7f928b5375a20fd8d33556632128e936ad436)
* Unconditionally generate unknown field accessors. (https://github.com/protocolbuffers/protobuf/commit/dd8a3cf2b54a06ef0558c004f9fca570278ad4a1)
* Introduce proto filter for inject_field_listener_events. (https://github.com/protocolbuffers/protobuf/commit/2dc5338ea222e1f4e0357e46b702ed6a0e82aaeb)
* Add ParseFromCord to TextFormat (https://github.com/protocolbuffers/protobuf/commit/055a6c669fd1ee67803f71dcc55a3b746376934f)
* Mark proto2::Arena::GetArena as deprecated. (https://github.com/protocolbuffers/protobuf/commit/9f959583da525ba006a6dc6b8b8b733e4d8c619a)
Java
* Adds `Timestamps.now()`. (https://github.com/protocolbuffers/protobuf/commit/295f1125ceff5e07dfb8bfd2d7bada6c28918c0c)
* Added Reflection::GetCord() method in C++ (https://github.com/protocolbuffers/protobuf/commit/6ecb5d097e8d9bfafeb5ec8d251827f0d444f2ce)
* Re-attach OSGI headers to lite,core, and util. This information was dropped in the move from maven to bazel. (https://github.com/protocolbuffers/protobuf/commit/4b5652b030eda12fa1c7ea3e1ddd8d0404bd4ac5)
* Add Java FileDescriptor.copyHeadingTo() which copies file-level settings (e.g. syntax, package, file options) to FileDescriptorProto.Builder (https://github.com/protocolbuffers/protobuf/commit/6e6d0bce4a04fd13d50485c22ecc7e96d9a16000)
* Remove unnecessary has bits from proto2 Java. (https://github.com/protocolbuffers/protobuf/commit/c440da9e1389db520b79acb19cb55e5b3266dfba)
* Add casts to make protobuf compatible with Java 1.8 runtime. (https://github.com/protocolbuffers/protobuf/commit/d40aadf823cf7e1e62b65561656f689da8969463)
* Fix mutability bug in Java proto lite: sub-messages inside of oneofs were not (https://github.com/protocolbuffers/protobuf/commit/fa82155c653776304bf6d03c33bea744db1b5eff)
* Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (https://github.com/protocolbuffers/protobuf/commit/1de344fcd1c1b2c6ec937151d69634171463370d)
Kotlin
* Remove errorprone dependency from kotlin protos. (https://github.com/protocolbuffers/protobuf/commit/7b6e8282157f0280ecb3fd9fd4c6519a7cd5afbc)
Csharp
* Make json_name take priority over name (fully) in C parsing (12262) (https://github.com/protocolbuffers/protobuf/commit/4326e0f852a3cf47c30bf99db66c3e3e77658dfb)
* Add C presence methods to proto3 oneof fields. (https://github.com/protocolbuffers/protobuf/commit/affadac847370221e2ec0e405d5715b4a22e518f)
Objective-C
* Enforce the max message size when serializing to binary form. (https://github.com/protocolbuffers/protobuf/commit/e6d01b2edcb04fdfb0f3cf79bf9d427f57fa2eac)
* Mark mergeFromData:extensionRegistry: as deprecated. (https://github.com/protocolbuffers/protobuf/commit/e3b00511099838e22f59827bfb7c72e27fcc22fa)
Python
* Fix bug in _internal_copy_files where the rule would fail in downstream repositories. (https://github.com/protocolbuffers/protobuf/commit/b36c39236e43f4ab9c1472064b6161d00aef21c5)
* Make numpy/pip_deps a test-only dependency. (https://github.com/protocolbuffers/protobuf/commit/fe038fc9d2e6a469c3cd2f1a84a6560c0a123481)
* Fix Python bug with required fields (https://github.com/protocolbuffers/protobuf/commit/579f4ab70dc5c37f075a0b3f186fe80dcdf8165d)
* Mark deprecated SupportsUnknownEnumValues on Message reflection. Use FieldDescriptor or EnumDescriptor instead. (https://github.com/protocolbuffers/protobuf/commit/0b9134bb4eb281c3ed1446e8acf1aa354e0fe67e)
* Raise warnings for MessageFactory class usages (https://github.com/protocolbuffers/protobuf/commit/dd9dd86fbca3ab5c1c7f0aa2534dc5da61530711)
* Add Python support for retention attribute (https://github.com/protocolbuffers/protobuf/commit/63389c027f474954e8178e77ac624e8ef952626d)
* Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (https://github.com/protocolbuffers/protobuf/commit/1de344fcd1c1b2c6ec937151d69634171463370d)
Python C-Extension (Default)
* Fix Python bug with required fields (https://github.com/protocolbuffers/upb/commit/ea4cb79f669e69342d7ced4d0255050325df41e3)
* *See also UPB changes below, which may affect Python C-Extension (Default).*
PHP
* RepeatedField: unset by index (11425) (https://github.com/protocolbuffers/protobuf/commit/363fa89b1f02d4c51028f8c8bcd506f08eaa6b49)
PHP C-Extension
* RepeatedField: unset by index (11425) (https://github.com/protocolbuffers/protobuf/commit/363fa89b1f02d4c51028f8c8bcd506f08eaa6b49)
* *See also UPB changes below, which may affect PHP C-Extension.*
Ruby
* Change the Ruby code generator to emit a serialized proto instead of the DSL (12319) (https://github.com/protocolbuffers/protobuf/commit/bd52d0483987f1a5186fc3daa261d1d76a787bcf)
* Feat(6178): emit ruby enum as integer (11673) (https://github.com/protocolbuffers/protobuf/commit/8aa2b177f156393ce607b4ffea8c1ac28560c746)
Ruby C-Extension
* Feat(6178): emit ruby enum as integer (11673) (https://github.com/protocolbuffers/protobuf/commit/8aa2b177f156393ce607b4ffea8c1ac28560c746)
* Ruby: Implement Write Barriers (11793) (https://github.com/protocolbuffers/protobuf/commit/d82d8a48f6c50ae6c811dbd6b7383e36a691c6b3)
* *See also UPB changes below, which may affect Ruby C-Extension.*
UPB (Python/PHP/Ruby C-Extension)
* Implements upb_Message_DeepClone. (https://github.com/protocolbuffers/upb/commit/3286f948f888f0c912c4ec483db9a1a50a6782a3)
Other
* Fix: missing -DPROTOBUF_USE_DLLS in pkg-config (12700) (https://github.com/protocolbuffers/protobuf/commit/1ca4e9c4859a23112684138c78608ddc0b8f1770)
* Avoid using string(JOIN..., which requires cmake 3.12 (https://github.com/protocolbuffers/protobuf/commit/54caf40312b3e7fd7794e267ef17e3be202de83d)
* Bump Abseil submodule to 20230125.3 (12660) (https://github.com/protocolbuffers/protobuf/commit/750a6e7d7cbd8c022e18834f0a57fcd76d2c3c58)
* Fix btree issue in map tests. (https://github.com/protocolbuffers/protobuf/commit/9898418bd9188b22e9db7f94529df638e65b14f7)
* Fix declared dependencies for pkg-config (12518) (https://github.com/protocolbuffers/protobuf/commit/f79e35c821a50c6a37ffe365511b892f5409ac44)
* Fix build for newlib (12501) (https://github.com/protocolbuffers/protobuf/commit/945bf3c48de64eb3c8a96f5dd36c19670c3dbcdd)
* Update usage disclaimer on FieldOptions.ctype (https://github.com/protocolbuffers/protobuf/commit/b8e7192a731a8ece54b11f2caf87c32209559525)
* Add config option to print 64-bit integers in JSON as unquoted ints if they can be losslessly converted into a 64-bit float. (https://github.com/protocolbuffers/protobuf/commit/330e10d53fe1c12757f1cdd7293d0881eac4d01e)
* Version protoc according to the compiler version number. (https://github.com/protocolbuffers/protobuf/commit/e67136d289e6cf4265e2763dd77216940c400ac9)
* Fix shared object ABI exports (5144) (11032) (https://github.com/protocolbuffers/protobuf/commit/462964ed322503af52638d54c00a0a67d7133349)
* Ensure VarintParseSlowArm{32,64} are exported with PROTOBUF_EXPORT (https://github.com/protocolbuffers/protobuf/commit/2ce56399e30db62e45869c6fd2d2bbacbb81a7ed)
* Update the min required CMake version to 3.10 (https://github.com/protocolbuffers/protobuf/commit/bcb20bbdfa0cba15c869d413edaaeb8507526a2e)