Protobuf

Announcements
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.

Compiler
* Implement proto2/proto3 with editions (https://github.com/protocolbuffers/protobuf/commit/3813b6622f6490b969c16e1b1ba7dcbd8f4e3209)
* Defines Protobuf compiler version strings as macros and separates out suffix string definition. (https://github.com/protocolbuffers/protobuf/commit/3c59585bc116bee70f5f00a10005ea1403aef062)
* Add utf8_validation feature back to the global feature set. (https://github.com/protocolbuffers/protobuf/commit/153028d7f3029e066bb2287012e14417ca83d55c)
* Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (https://github.com/protocolbuffers/protobuf/commit/4322e00e5b4c2f36016f0eee614e0e823a693ed4)
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)
* Editions: Introduce functionality to protoc for generating edition feature set defaults. (https://github.com/protocolbuffers/protobuf/commit/4019e254322b2312cc7431b45ae71bb8e3dfa035)
* Editions: Migrate edition strings to enum in C++ code. (https://github.com/protocolbuffers/protobuf/commit/f083ebf21f56783fd838c006880f8e16e05d1f1e)
* Create a reflection helper for ExtensionIdentifier. (https://github.com/protocolbuffers/protobuf/commit/4d5ab7324ef4d79eda69c8ed5bcb35f35e6db6f1)
* Editions: Provide an API for C++ generators to specify their features. (https://github.com/protocolbuffers/protobuf/commit/e897bcf3ff8004b7446bbe43a1fc28f9a92a11d4)
* Editions: Refactor feature resolution to use an intermediate message. (https://github.com/protocolbuffers/protobuf/commit/57d8049b01b4bd95a1ca156eb375b523dc7d5d56)
* Publish extension declarations with declaration verifications. (https://github.com/protocolbuffers/protobuf/commit/e72b0e181b236ff23c03a9f9f97f58e6989f25c9)
* Editions: Stop propagating partially resolved feature sets to plugins. (https://github.com/protocolbuffers/protobuf/commit/b66ef4c3f0af899e3736ad016259f9446f0adb14)
* Editions: Migrate string_field_validation to a C++ feature (https://github.com/protocolbuffers/protobuf/commit/1f9583069f0e2b11790ea36cc760ee371106f232)
* Editions: Include defaults for any features in the generated pool. (https://github.com/protocolbuffers/protobuf/commit/15863ffc9aff9d31e9f25a7f11a2d499b0170bc3)
* Protoc: parser rejects explicit use of map_entry option (13479) (https://github.com/protocolbuffers/protobuf/commit/8f5929230d5c5d117b84953463ef0da6d29ad36d)
* Protoc: validate that reserved range start is before end (13474) (https://github.com/protocolbuffers/protobuf/commit/3be00f7638b9a61d2f0318ceac9d7d89d5af66b6)
* Protoc: support identifiers as reserved names in addition to string literals (only in editions) (13471) (https://github.com/protocolbuffers/protobuf/commit/e701f4fa77620fc29109efc6902003d2cc93a30d)
* Drop support for Bazel 5. (https://github.com/protocolbuffers/protobuf/commit/a80daa2a2caaaac9ebe9ae6bb1b639c2771c5c55)
* Allow code generators to specify whether or not they support editions. (https://github.com/protocolbuffers/protobuf/commit/2176a145ba210c286177032037e736bf97158f7d)

C++
* Apply PROTOBUF_NOINLINE to declarations of some functions that want it. (https://github.com/protocolbuffers/protobuf/commit/6e848b00c95556d4f4fc7a1a512cd31a33de75d6)
* Implement proto2/proto3 with editions (https://github.com/protocolbuffers/protobuf/commit/3813b6622f6490b969c16e1b1ba7dcbd8f4e3209)
* Make JSON UTF-8 boundary check inclusive of the largest possible UTF-8 character. (https://github.com/protocolbuffers/protobuf/commit/e80b8ec620d71cdeca000dce835e5a167a8dc370)
* Reduce `Map::size_type` to 32-bits. Protobuf containers can't have more than (https://github.com/protocolbuffers/protobuf/commit/95d2b2ed5039c1b1606a5f8c9d9cb362a2a33c95)
* Defines Protobuf compiler version strings as macros and separates out suffix string definition. (https://github.com/protocolbuffers/protobuf/commit/3c59585bc116bee70f5f00a10005ea1403aef062)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on generated oneof accessors. (https://github.com/protocolbuffers/protobuf/commit/e33e0d2ba569c8a7d6d74b5a8b39d804ec2a0169)
* Fix bug in reflection based Swap of map fields. (https://github.com/protocolbuffers/protobuf/commit/bef5b759f1fa511e3c08380a4e8635832d5d39fd)
* Add utf8_validation feature back to the global feature set. (https://github.com/protocolbuffers/protobuf/commit/153028d7f3029e066bb2287012e14417ca83d55c)
* Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (https://github.com/protocolbuffers/protobuf/commit/4322e00e5b4c2f36016f0eee614e0e823a693ed4)
* Add prefetching to arena allocations. (https://github.com/protocolbuffers/protobuf/commit/fbdeb5af0b0f89dec79efc371ba75f838ffad2e8)
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on generated repeated and map field accessors. (https://github.com/protocolbuffers/protobuf/commit/9a0a3cf0cd8b4ac5c8a06db89f76c5d754f850d0)
* Editions: Migrate edition strings to enum in C++ code. (https://github.com/protocolbuffers/protobuf/commit/f083ebf21f56783fd838c006880f8e16e05d1f1e)
* Workaround ICE on gcc 7.5 by not having one overload call the other one with a (https://github.com/protocolbuffers/protobuf/commit/0522054f3ee5e32c9df15af7c11f046e91e77998)
* Create a reflection helper for ExtensionIdentifier. (https://github.com/protocolbuffers/protobuf/commit/4d5ab7324ef4d79eda69c8ed5bcb35f35e6db6f1)
* Editions: Provide an API for C++ generators to specify their features. (https://github.com/protocolbuffers/protobuf/commit/e897bcf3ff8004b7446bbe43a1fc28f9a92a11d4)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on generated string field accessors. (https://github.com/protocolbuffers/protobuf/commit/18c338a699e7dfe85de014bf74cdf9c8a5ee155f)
* Editions: Refactor feature resolution to use an intermediate message. (https://github.com/protocolbuffers/protobuf/commit/57d8049b01b4bd95a1ca156eb375b523dc7d5d56)
* Fixes for 32-bit MSVC. (https://github.com/protocolbuffers/protobuf/commit/66cf6b1d9c22333a20d83ee02472e2e7162a8da6)
* Publish extension declarations with declaration verifications. (https://github.com/protocolbuffers/protobuf/commit/e72b0e181b236ff23c03a9f9f97f58e6989f25c9)
* Export the constants in protobuf's any.h to support DLL builds. (https://github.com/protocolbuffers/protobuf/commit/fd24b1bef4a5969ca1e1875e53e31f866e4b757b)
* Implement AbslStringify for the Descriptor family of types. (https://github.com/protocolbuffers/protobuf/commit/230232a041d7bce0080f459512ee2162ee9233e7)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on generated message field accessors. (https://github.com/protocolbuffers/protobuf/commit/064035c0978516dceb64512e2e5fcf26aa2dedaa)
* Editions: Stop propagating partially resolved feature sets to plugins. (https://github.com/protocolbuffers/protobuf/commit/b66ef4c3f0af899e3736ad016259f9446f0adb14)
* Editions: Migrate string_field_validation to a C++ feature (https://github.com/protocolbuffers/protobuf/commit/1f9583069f0e2b11790ea36cc760ee371106f232)
* Editions: Include defaults for any features in the generated pool. (https://github.com/protocolbuffers/protobuf/commit/15863ffc9aff9d31e9f25a7f11a2d499b0170bc3)
* Introduce C++ feature for UTF8 validation. (https://github.com/protocolbuffers/protobuf/commit/c7119e6d56ea8e29f32ce5eb84fca82799095239)
* Protoc: validate that reserved range start is before end (13474) (https://github.com/protocolbuffers/protobuf/commit/3be00f7638b9a61d2f0318ceac9d7d89d5af66b6)
* Remove option to disable the table-driven parser in protoc. (https://github.com/protocolbuffers/protobuf/commit/6d03f9b19bd7aa10d541f6c1a11ac71f2851eece)
* Lock down ctype=CORD in proto file. (https://github.com/protocolbuffers/protobuf/commit/b359e5020a68ce84faec5952100ae482e9eb0b1c)
* Support split repeated fields. (https://github.com/protocolbuffers/protobuf/commit/5b5e5bf5444f80033977d22024cf2dffd5d1c89b)
* In OSS mode omit some extern template specializations. We have seen reports of (https://github.com/protocolbuffers/protobuf/commit/ab968248b02842cf7733ba867cb6a53e680956c1)
* Automated rollback of commit adb2c4b415c35cda3e4394384ec579ea8dd8ec92. (https://github.com/protocolbuffers/protobuf/commit/0ea00526a11c405b342463cf75f40ca5753d4a0c)
* Allow code generators to specify whether or not they support editions. (https://github.com/protocolbuffers/protobuf/commit/2176a145ba210c286177032037e736bf97158f7d)
* Handle conflicting macros for FreeBSD (13303) (https://github.com/protocolbuffers/protobuf/commit/2a952958eb1d4ea13fee2ad657a537ad443adf8f)

Java
* Implement proto2/proto3 with editions (https://github.com/protocolbuffers/protobuf/commit/3813b6622f6490b969c16e1b1ba7dcbd8f4e3209)
* Remove synthetic oneofs from Java gencode field accessor tables. (https://github.com/protocolbuffers/protobuf/commit/9ad2268544a345d9ed449e766999388b895d18a3)
* Timestamps.parse: Add error handling for invalid hours/minutes in the timezone offset. (https://github.com/protocolbuffers/protobuf/commit/8f8513835c0c4ebe206a5ead04a1bd0c8c7d1dbf)
* Defines Protobuf compiler version strings as macros and separates out suffix string definition. (https://github.com/protocolbuffers/protobuf/commit/3c59585bc116bee70f5f00a10005ea1403aef062)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on generated oneof accessors. (https://github.com/protocolbuffers/protobuf/commit/e33e0d2ba569c8a7d6d74b5a8b39d804ec2a0169)
* Automated rollback of commit 2a55706f9d36afd1742c97fd0d611ea8af0ac3f8. (https://github.com/protocolbuffers/protobuf/commit/30b6251dea7a0ff1713a97d7e7d29a48e4880f59)
* Add missing debugging version info to Protobuf Java gencode when multiple files are generated. (https://github.com/protocolbuffers/protobuf/commit/301dfc5aebb37eee302beef408b6ba4b4eaf4425)
* Fix a bad cast in put<X>BuilderIfAbsent when already present due to using the result of put() directly (which is null if it currently has no value) (https://github.com/protocolbuffers/protobuf/commit/785c82dbdea5085628f2a41437aa1198860f3342)
* Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (https://github.com/protocolbuffers/protobuf/commit/4322e00e5b4c2f36016f0eee614e0e823a693ed4)
* Fix a NPE in put<X>BuilderIfAbsent due to using the result of put() directly (which is null if it currently has no value) (https://github.com/protocolbuffers/protobuf/commit/47cec39ab36daf5264c2faf05d2ed4d0f48c1bc7)
* Update Kotlin compiler to escape package names (13310) (https://github.com/protocolbuffers/protobuf/commit/437ec356fbe15d8737d797505aafb8e2b2629e7b)
* Add MapFieldBuilder and change codegen to generate it and the put{field}BuilderIfAbsent method. (https://github.com/protocolbuffers/protobuf/commit/955d4ab0d681d2bf60b481c1d066eee543ab1b8c)
* Introduce recursion limit in Java text format parsing (https://github.com/protocolbuffers/protobuf/commit/bca3bed137d013d4a654ffec52c0d44a3202aab2)
* Consider the protobuf.Any invalid if typeUrl.split("/") returns an empty array. (https://github.com/protocolbuffers/protobuf/commit/004f54af8f014c3e8a65db1b4459cfa70502e3ce)
* Mark `FieldDescriptor.hasOptionalKeyword()` as deprecated. (https://github.com/protocolbuffers/protobuf/commit/d6157f7c7ec78a6942cfd6d96d2e0b40e007ae0d)

Kotlin
* Add ByteString.isNotEmpty Kotlin extension function. (https://github.com/protocolbuffers/protobuf/commit/961779e164a8f8a015a44b082c01da2e1273b26c)

Csharp
* Add C deterministic serialization (13160) (https://github.com/protocolbuffers/protobuf/commit/96100bf1e49c5452f21e4446e43f5e7526f1351f)
* Add .NET debugging attributes (14097) (https://github.com/protocolbuffers/protobuf/commit/67b9c76752b21c894bc8d7d59b3f6b2dc078c7b1)
* Improve .NET debugging of Protobuf messages (13838) (https://github.com/protocolbuffers/protobuf/commit/e519c62f827a5f354c9253419c2fb5c230622311)
* Lock down ctype=CORD in proto file. (https://github.com/protocolbuffers/protobuf/commit/b359e5020a68ce84faec5952100ae482e9eb0b1c)

Objective-C
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)
* [ObjC] Flip the default for two generation options. (https://github.com/protocolbuffers/protobuf/commit/08bbb577e8de8cd9afd56c6f78ab86418ef4bd4e)
* [ObjC] Enable generation of .proto files using editions. (https://github.com/protocolbuffers/protobuf/commit/55ab8316c14569cadc578e15ffdea4f1bcbb0964)
* [ObjC] add "generate_minimal_imports" generation option (https://github.com/protocolbuffers/protobuf/commit/0b817d46d4ca1977d3dccf2442aeee3c9e98e3a1)
* [ObjC] Add generation control for descriptor custom options. (https://github.com/protocolbuffers/protobuf/commit/bd9d6895c3d3f5f186d31b3e41bc0ad6af9d3129)
* Lock down ctype=CORD in proto file. (https://github.com/protocolbuffers/protobuf/commit/b359e5020a68ce84faec5952100ae482e9eb0b1c)

Rust
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)

Python
* Loosen upb for json name conflict check in proto2 between json name and field (https://github.com/protocolbuffers/protobuf/commit/41af1d53a2d82ee17d6a3ac8a81ea2a93040ad82)
* Defines Protobuf compiler version strings as macros and separates out suffix string definition. (https://github.com/protocolbuffers/protobuf/commit/3c59585bc116bee70f5f00a10005ea1403aef062)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on generated oneof accessors. (https://github.com/protocolbuffers/protobuf/commit/e33e0d2ba569c8a7d6d74b5a8b39d804ec2a0169)
* Ensure Timestamp.ToDatetime(tz) has correct offset (https://github.com/protocolbuffers/protobuf/commit/f0c56f9bc49b5015293eb5242a1982107b7c8b39)
* Do not check required field for upb python MergeFrom (https://github.com/protocolbuffers/protobuf/commit/1e0bc565a0f02b5f833f6057f13021a96a329eeb)
* Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (https://github.com/protocolbuffers/protobuf/commit/4322e00e5b4c2f36016f0eee614e0e823a693ed4)
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)
* Comparing a proto message with an object of unknown returns NotImplemented (https://github.com/protocolbuffers/protobuf/commit/12d4f418a7311ed4d381bf82caead11d03ae7911)
* Emit __slots__ in pyi output as a tuple rather than a list for --pyi_out. (https://github.com/protocolbuffers/protobuf/commit/4a4f61589d3b258b5f1d2be752ff5dd01e7283d8)
* Fix a bug that strips options from descriptor.proto in Python. (https://github.com/protocolbuffers/protobuf/commit/27d42c5ba7ab65956e71b9d825f68ef84c38bbde)
* Raise warings for message.UnknownFields() usages and navigate to the new add (https://github.com/protocolbuffers/protobuf/commit/c988759a9bb5ce719721b6581d035c277b147db2)
* Add protobuf python keyword support in path for stub generator. Also added tests for (https://github.com/protocolbuffers/protobuf/commit/4cc258a6a1cb6d3e526e3ca2f6ab7748ee84e2e3)
* Add tuple support to set Struct (https://github.com/protocolbuffers/protobuf/commit/533fbbb45e666784a671aa9cb4ed5dd6a844a5a9)

Python C-Extension (Default)
* Comparing a proto message with an object of unknown returns NotImplemented (https://github.com/protocolbuffers/upb/commit/243add441169730acc42e6bad3a1a06a7f0b8e69)
* *See also UPB changes below, which may affect Python C-Extension (Default).*

PHP
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)

Ruby
* Ruby FFI implementation (13343) (https://github.com/protocolbuffers/protobuf/commit/c52d80cf04274aefd557e2bc93f64bb71c097645)

Ruby C-Extension
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)
* Ruby: Fix object cache lookups on 32-bit platforms (13494) (https://github.com/protocolbuffers/protobuf/commit/055c3782f6911822667157dab58341e44f9deedc)
* Ruby FFI implementation (13343) (https://github.com/protocolbuffers/protobuf/commit/c52d80cf04274aefd557e2bc93f64bb71c097645)
* *See also UPB changes below, which may affect Ruby C-Extension.*

UPB (Python/PHP/Ruby C-Extension)
* Loosen upb for json name conflict check in proto2 between json name and field (https://github.com/protocolbuffers/protobuf/commit/41af1d53a2d82ee17d6a3ac8a81ea2a93040ad82)
* Add utf8_validation feature back to the global feature set. (https://github.com/protocolbuffers/protobuf/commit/153028d7f3029e066bb2287012e14417ca83d55c)
* Do not check required field for upb python MergeFrom (https://github.com/protocolbuffers/protobuf/commit/1e0bc565a0f02b5f833f6057f13021a96a329eeb)
* Merge the protobuf and upb Bazel repos (https://github.com/protocolbuffers/protobuf/commit/7286ffceb2f0a4489672a90c823e00425ab8ab5c)
* Cherry-pick recent changes from the upb repo (13908) (https://github.com/protocolbuffers/protobuf/commit/b2e39c175a690ba76f1cf05ebb17f003f6bcd610)
* Added malloc_trim() calls to Python allocator so RSS will decrease when memory is freed (https://github.com/protocolbuffers/protobuf/commit/56e9f2b4e467a7df5989a61eec142df7c72ab796)
* Upb: fix a Python memory leak in ByteSize() (https://github.com/protocolbuffers/protobuf/commit/e45a6d50682d5d4b204e7d76254b1585b43c6815)
* Support ASAN detection on clang (1424) (https://github.com/protocolbuffers/upb/commit/1b0011dfef3062ac25b0b2250c3140312b97fdf0)
* Upb: bugfix for importing a proto3 enum from within a proto2 file (https://github.com/protocolbuffers/upb/commit/b19edc5ce0b0dd6591e7b8f65430b0f3e3ea1c29)
* Expose methods needed by Ruby FFI using UPB_API (1391) (https://github.com/protocolbuffers/upb/commit/01fed1cc1ba255bf22b49393ba054b8d270e6ba3)
* Fix `PyUpb_Message_MergeInternal` segfault (1338) (https://github.com/protocolbuffers/upb/commit/cefa206f546ce36f895cd02ab5a7e8a1f6918a22)

Other
* Expose alias to protobuf_nowkt runtime (https://github.com/protocolbuffers/protobuf/commit/5b6c2459b57c23669d6efc5a14a874c693004eec)
* Update absl submodule and dep to latest 20230802.0 LTS (13515) (https://github.com/protocolbuffers/protobuf/commit/e7bb34db3c57617f772a04d343a8bfa5109cf6cf)

Announcements
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.

C++
* Add dependency on absl::layout, and explicitly include absl layout includes (14042) (https://github.com/protocolbuffers/protobuf/commit/96c1a7d47702f6c82b96e2a0ff112b30ea85c330)
* Include Abseil's str_cat.h for absl::AlphaNum (14054) (https://github.com/protocolbuffers/protobuf/commit/955d371eacedc37eeff8bf61a1046d694a5fbc8a)


Java
* Rolled back breaking change to gencode before 3.15 (14246) (https://github.com/protocolbuffers/protobuf/commit/b9cf19ba5ec4aa6ff108933fa4a1adb075f8c4fb)

Python
* Fix python code generation compatibility with Cython (14240) (https://github.com/protocolbuffers/protobuf/commit/fe87c909399c45d54374817a52af40d6cfd8e063)

Announcements
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.

C++
* Workaround ICE on gcc 7.5 by not having one overload call the other one with a (13808) (https://github.com/protocolbuffers/protobuf/commit/398a84ce486d282e217f1120b810626c6b71f058)

Python

Python C-Extension (Default)
* Added malloc_trim() calls to Python allocator so RSS will decrease when memory is freed (https://github.com/protocolbuffers/upb/commit/b0f5d5d94d9faafed2ab0fcaa9396cb4a984a2c1)

UPB (Python/PHP/Ruby C-Extension)
* fix a Python memory leak in ByteSize() ([1243](https://github.com/protocolbuffers/upb/issues/1243)) ([e45a6d5](https://github.com/protocolbuffers/protobuf/commit/e45a6d50682d5d4b204e7d76254b1585b43c6815))

C++
* Fixes for 32-bit MSVC. (https://github.com/protocolbuffers/protobuf/commit/01e1a5c28ae00cca0821a95e3c68447df4d1591c)

Announcements
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.

Python

Python C-Extension (Default)
* Revert CopyFrom() optimization that was causing crashes back to Serialize/Parse (https://github.com/protocolbuffers/upb/commit/78e96941a47108dae2bbcb39cc481a848d3bfa67)

Ruby

Ruby C-Extension
* Ruby: Fix object cache lookups on 32-bit platforms (13494) (13580) (https://github.com/protocolbuffers/protobuf/commit/3094b492468caafcdb61c132dab636cc3c87773f)

Announcements
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.

Compiler
* Drop support for Bazel 5. (https://github.com/protocolbuffers/protobuf/commit/fff490558816802c5b3d51169f797046f369453f)
* Allow code generators to specify whether or not they support editions. (https://github.com/protocolbuffers/protobuf/commit/e2cec78455769881b9e8c23babeb3fe8effe81fe)
* Release prototype of Protobuf Editions. (https://github.com/protocolbuffers/protobuf/commit/4f9e41767a819abf8108bb29e4910fbc0f37dc6e)
* Compiler: Correct depfile generation when there are no outputs (https://github.com/protocolbuffers/protobuf/commit/a44fc2b063d7466d48e2aeba05f9c35654140d87)
* Add dllexport_decl for generated default instance. (13085) (https://github.com/protocolbuffers/protobuf/commit/9d0961afb712de0aa6f6fea681f4a7241faac6e2)
* In TSan mode, detect concurrent mutations of repeated/map fields. (https://github.com/protocolbuffers/protobuf/commit/d800c5f08b184d261e6c47662035d554f109eb3b)
* Add a workaround for GCC constexpr bug (https://github.com/protocolbuffers/protobuf/commit/e15326ba807a49365b6c9f5958e969b5aa915f8c)
* Turn on the table-driven parser by default, as it is no longer experimental. (https://github.com/protocolbuffers/protobuf/commit/c3e2efe70bbdfba4dd1f5c570043688fcbe74497)
* Shrink code size of generated protocol buffer code via a few (https://github.com/protocolbuffers/protobuf/commit/97c351319ffa9715ed11a883c4adbaadf63a2fcc)
* Implement enforcement of target constraints (https://github.com/protocolbuffers/protobuf/commit/e3848c19988e56a20fbd3fab5d181df6de575a69)
* Fix(libprotoc): export useful symbols from .so (https://github.com/protocolbuffers/protobuf/commit/44b4bcc9e08b91dfeeb608c9d7c815f7cf2e00de)

C++
* In OSS mode omit some extern template specializations. We have seen reports of compilers falling over due to the size of translation units. (https://github.com/protocolbuffers/protobuf/commit/2ed49c95f9abbdf35e741c8a4e85976142fa9ff8)
* Automated rollback of commit adb2c4b415c35cda3e4394384ec579ea8dd8ec92. (https://github.com/protocolbuffers/protobuf/commit/9f2d7ea773217cac09630eef63d91e22b1b00d60)
* Fix building shared libraries on MinGW-w64 (13240) (https://github.com/protocolbuffers/protobuf/commit/c2f07bb80f5273f5ba8f3e1c25d124f47e3f5430)
* Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (https://github.com/protocolbuffers/protobuf/commit/0275e516229daca19d29b5915ec78fe19e317e43)
* Release prototype of Protobuf Editions. (https://github.com/protocolbuffers/protobuf/commit/4f9e41767a819abf8108bb29e4910fbc0f37dc6e)
* Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (https://github.com/protocolbuffers/protobuf/commit/e2eae81b973c6944f3062fc21929368467e0ddb3)
* Fix case of locality optimizer being wrong for split repeated fields and add a check that the optimized order has the same size as the unoptimized order. (https://github.com/protocolbuffers/protobuf/commit/76a327e1e1f02e2f8027d4dd02950711435ea461)
* Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (https://github.com/protocolbuffers/protobuf/commit/80dbc50118c0ef5d38da727d1cf903408ea21b41)
* Mark single arg ctor explicit in DynamicMessageFactory. (https://github.com/protocolbuffers/protobuf/commit/8fe88a5a07578dd5bd3aa648e8c2f95a22407094)
* Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (https://github.com/protocolbuffers/protobuf/commit/6d79d13e478d677e7bdc1587d3442a070d5205cd)
* Let ParseRepeatedStringOnce call AllocateFromStringBlock(). (https://github.com/protocolbuffers/protobuf/commit/bcf3e36a48c573a81d6359a61275f477a7b57c2d)
* Check next tag in MpRepeatedMessage. (https://github.com/protocolbuffers/protobuf/commit/9e1cf6fe9c762ddd21bcea5039cdbf1f7b509eea)
* When parsing repeated primitives, append to a tmp array on stack. (https://github.com/protocolbuffers/protobuf/commit/adb2c4b415c35cda3e4394384ec579ea8dd8ec92)
* Add dllexport_decl for generated default instance. (13085) (https://github.com/protocolbuffers/protobuf/commit/9d0961afb712de0aa6f6fea681f4a7241faac6e2)
* `TextFormat::ParseFieldValueFromString` now takes `absl::string_view` as `input` instead of `const std::string &` (https://github.com/protocolbuffers/protobuf/commit/5411fc66796d9e14d39b7ba0385eee5ffde875dc)
* In TSan mode, detect concurrent mutations of repeated/map fields. (https://github.com/protocolbuffers/protobuf/commit/d800c5f08b184d261e6c47662035d554f109eb3b)
* Use the same ABI for static and shared libraries on non-Windows platforms (12983) (https://github.com/protocolbuffers/protobuf/commit/4329fde9cf3fab7d1b3a9abe0fbeee1ad8a8b111)
* Replace ColdChunkSkipper with iterator-based approach. (https://github.com/protocolbuffers/protobuf/commit/ad677f3215de203695ade78a25f79fa61010f770)
* Check invalid type_id after casting it to uint32_t. (https://github.com/protocolbuffers/protobuf/commit/d8901265c75387851b7b66624b5bcc5bafa9bad9)
* Strengthen assertions on reflection methods. (https://github.com/protocolbuffers/protobuf/commit/eb5e9e01d9831e9fae48bc6f688114f53cccabc5)
* Add assertions to reflection methods. (https://github.com/protocolbuffers/protobuf/commit/5866e4575c7e43cfcabb98efd6f36b4ba5c4bb30)
* Fail to parse message sets if type_id is zero. (https://github.com/protocolbuffers/protobuf/commit/bc1b1f6e53e9844ed42c796c7246d51aef65ed65)
* Enable the use of [SU]Int32Size and EnumSize templates for AArch64 (11102) (https://github.com/protocolbuffers/protobuf/commit/e285d3e307512f24576b56d18cb5a5b655e2f393)
* Add a workaround for GCC constexpr bug (https://github.com/protocolbuffers/protobuf/commit/e15326ba807a49365b6c9f5958e969b5aa915f8c)
* Add `ABSL_ATTRIBUTE_LIFETIME_BOUND` attribute on Map, RepeatedField and RepeatedPtrField. (https://github.com/protocolbuffers/protobuf/commit/7b7ba2df67199a2c95b21ce6eec9e6d62b71cc60)
* Turn on the table-driven parser by default, as it is no longer experimental. (https://github.com/protocolbuffers/protobuf/commit/c3e2efe70bbdfba4dd1f5c570043688fcbe74497)
* Fix: avoid warnings on MSVC (12697) (https://github.com/protocolbuffers/protobuf/commit/4fcf2c0a0968c88c60570da8fa6d7a18371c4b4b)
* Fix: avoid warnings on Windows (12701) (https://github.com/protocolbuffers/protobuf/commit/f9108c2dd0921db50bb78e3fc6f0833186f8cf64)
* Shrink code size of generated protocol buffer code via a few (https://github.com/protocolbuffers/protobuf/commit/97c351319ffa9715ed11a883c4adbaadf63a2fcc)
* Fix(libprotoc): export useful symbols from .so (12619) (https://github.com/protocolbuffers/protobuf/commit/b1ae4fa87a95ee3650a6ad4192176d845e03da52)
* Forbid embedded nulls in `json_name`. (https://github.com/protocolbuffers/protobuf/commit/b478a29bf0945d5b141992885ac9cfde45c66697)
* Implement option retention for C (https://github.com/protocolbuffers/protobuf/commit/5f64444e7b19421c25ae12d3c69acbab3a70a1bb)
* Implement enforcement of target constraints (https://github.com/protocolbuffers/protobuf/commit/e3848c19988e56a20fbd3fab5d181df6de575a69)
* Make RepeatedField and RepeatedPtrField be destructor skippable for proto arenas. (https://github.com/protocolbuffers/protobuf/commit/e4168df564be12984ae836e5e870e634733f42a3)
* Update MessageDifferencer to conditionally force comparing additional fields while doing PARTIAL comparison (compare fields which are not repeated, have no presence and are set to their default value). (https://github.com/protocolbuffers/protobuf/commit/748f57f2b67c56e050b660ffbafb9f3a5795c28a)
* CMake: Use the correct jsoncpp target name in static builds (12733) (https://github.com/protocolbuffers/protobuf/commit/d372fcded6390d396d116ee984c000983beecabc)
* Fix: missing -DPROTOBUF_USE_DLLS in pkg-config (12700) (https://github.com/protocolbuffers/protobuf/commit/f86008a548c80021bc6e72de0f992a87d68e7ce4)
* Avoid using string(JOIN..., which requires cmake 3.12 (https://github.com/protocolbuffers/protobuf/commit/adee0a59f914e8bc2982b716afef2ff3b72f67a5)

Java
* Put a 4k limit on preallocation to prevent OOM from malformed inputs. (https://github.com/protocolbuffers/protobuf/commit/173adca21659bfd06ae23f07d48129e7633d1f2e)
* Mark OneofDescriptor.isSynthetic() deprecated. (https://github.com/protocolbuffers/protobuf/commit/b6b86e21fb67e22b762b7230427bce00ee8c9fec)
* Use ProtobufArrayList for repeated bytes field. Presize primitive arrays for fixed-length primitives. (https://github.com/protocolbuffers/protobuf/commit/b0b926a141e261ab1e4d41715c1d51cc31db46dd)
* Add protobuf-kotlin into protobuf-bom (12936) (https://github.com/protocolbuffers/protobuf/commit/943b696094631cf263c6d9f92811c7a3419ef17c)
* Handle clear for Java proto3 optionals (synthetic oneofs) using field descriptor instead of clear method. (https://github.com/protocolbuffers/protobuf/commit/a5349027e3f0d7503bcab55240f18ec657e2dad7)
* Deps: Update Guava to 32.0.0 (12953) (https://github.com/protocolbuffers/protobuf/commit/cd615a8c6596de1fc35874561b53d26597c0b65a)
* Migrate repeated numeric fields to use bit field to track presence instead of using it to indicate the field mutability to potentially skip work on the field during build operations. (https://github.com/protocolbuffers/protobuf/commit/f0de774705b43e120c43a545033ed29728351bdc)
* Automated rollback of commit 3e188b7c04cfdaec134cb59831f009c1ce1d7f12. (https://github.com/protocolbuffers/protobuf/commit/a1b3ff0ddb33b3535bf415474d2f1a561883a81f)

Csharp
* [C] Replace regex that validates descriptor names (12174) (https://github.com/protocolbuffers/protobuf/commit/cfb702a0788f57b6f321cd7a039701f0f53a19c2)
* Implement option retention for C (https://github.com/protocolbuffers/protobuf/commit/5f64444e7b19421c25ae12d3c69acbab3a70a1bb)

Objective-C
* Release prototype of Protobuf Editions. (https://github.com/protocolbuffers/protobuf/commit/4f9e41767a819abf8108bb29e4910fbc0f37dc6e)
* Check invalid type_id after casting it to uint32_t. (https://github.com/protocolbuffers/protobuf/commit/d8901265c75387851b7b66624b5bcc5bafa9bad9)
* Fix jruby encoding in new thread (12919) (https://github.com/protocolbuffers/protobuf/commit/6609bea792af9624f460dad0213bb47fd1ccf623)
* Add assertions to reflection methods. (https://github.com/protocolbuffers/protobuf/commit/5866e4575c7e43cfcabb98efd6f36b4ba5c4bb30)
* [C] Replace regex that validates descriptor names (12174) (https://github.com/protocolbuffers/protobuf/commit/cfb702a0788f57b6f321cd7a039701f0f53a19c2)

Python
* Raise warinings when extend repeated field with none iterable in OSS. OSS will raise errors soon (https://github.com/protocolbuffers/protobuf/commit/96ca7d96daf6694341843350a162d9940e7552d3)
* Remove RegisterExtension in message class (https://github.com/protocolbuffers/protobuf/commit/3560e2381efc3e01e67cc895383d270cd5492e13)
* Removed message._extensions_by_number (https://github.com/protocolbuffers/protobuf/commit/86fc32cedc7aa01798938d5f860094fc21874b93)
* Removed message._extensions_by_name (https://github.com/protocolbuffers/protobuf/commit/e737c8108a72d26e706f6eb5cbc814736a9d2389)
* Remove RegisterExtension() in python generated code (https://github.com/protocolbuffers/protobuf/commit/e5a7a2eba79f697e2c2823dfbb95659088f994a6)
* Deprecated APIs that add non top descriptors to pool will be removed soon (https://github.com/protocolbuffers/protobuf/commit/3f5d844d9068de034df8db49a3c91f9100bd192d)

Python C-Extension (Default)
* Remove RegisterExtension in message class (https://github.com/protocolbuffers/upb/commit/cbacdf152a04abc7e849b68ba6c4eaeb3c3669e3)
* *See also UPB changes below, which may affect Python C-Extension (Default).*

PHP
* Adding provide to php composer.json (13141) (https://github.com/protocolbuffers/protobuf/commit/d603b4199e42d18a6ed433f47bdf8e5042900588)
* Require PHP version >=8.0, Ruby >=2.7, and Python >=3.8 (https://github.com/protocolbuffers/protobuf/commit/a5516ca6cc5e8034344879d1da83c946cff17ccf)
* Enable building PHP extension on Windows (13097) (https://github.com/protocolbuffers/protobuf/commit/4d9bbac167a651db960c4d334fa1c47ecd5130e2)
* Add support for option retention in PHP (https://github.com/protocolbuffers/protobuf/commit/ba348e2b3bf30f3d6f6c356020ac6999ddcf13b0)

PHP C-Extension
* Release prototype of Protobuf Editions. (https://github.com/protocolbuffers/protobuf/commit/4f9e41767a819abf8108bb29e4910fbc0f37dc6e)
* Enable building PHP extension on Windows (13097) (https://github.com/protocolbuffers/protobuf/commit/4d9bbac167a651db960c4d334fa1c47ecd5130e2)
* Remove RegisterExtension in message class (https://github.com/protocolbuffers/protobuf/commit/3560e2381efc3e01e67cc895383d270cd5492e13)
* *See also UPB changes below, which may affect PHP C-Extension.*

Ruby
* Update ruby gemspec required ruby version to >=2.7 (https://github.com/protocolbuffers/protobuf/commit/14ea2cb2966f6ede44b91d5594d46d8ea45b64ef)
* Refactor the object cache to better account for race conditions (13204) (https://github.com/protocolbuffers/protobuf/commit/a01d047456783b46a4ca675eee881de110a88799)
* Fix jruby encoding in new thread (12919) (https://github.com/protocolbuffers/protobuf/commit/6609bea792af9624f460dad0213bb47fd1ccf623)
* Implement option retention for Ruby (https://github.com/protocolbuffers/protobuf/commit/d96032d1a501d8d8ee2f581d0a9597d631797c5f)

Ruby C-Extension
* Refactor the object cache to better account for race conditions (13204) (https://github.com/protocolbuffers/protobuf/commit/a01d047456783b46a4ca675eee881de110a88799)
* Release prototype of Protobuf Editions. (https://github.com/protocolbuffers/protobuf/commit/4f9e41767a819abf8108bb29e4910fbc0f37dc6e)
* Remove RegisterExtension in message class (https://github.com/protocolbuffers/protobuf/commit/3560e2381efc3e01e67cc895383d270cd5492e13)
* *See also UPB changes below, which may affect Ruby C-Extension.*

UPB (Python/PHP/Ruby C-Extension)
* Fix `upb_MiniTableField_CType()` to work correctly for enums & strings. (https://github.com/protocolbuffers/upb/commit/532b4d0671c806f3f590fb0313b8fc73bd460c6d)
* Fixed a bug in `upb_Map_Delete()` that caused crashes in map.delete(k) for Ruby when string-keyed maps were in use. (https://github.com/protocolbuffers/upb/commit/14bad4a5bfd8ff8fced91010edac7dd3747a7bd7)

Other
* Drop Bazel 4 support and add Bazel 6 (https://github.com/protocolbuffers/protobuf/commit/4031712c34084f8c2bb4904e49e8a0d723ea8578)
* Bump Abseil submodule to 20230125.3 (12660) (https://github.com/protocolbuffers/protobuf/commit/2a3ce310843056fce9159af643c4785a0f8c85e2)
* Added a conformance test for embedded nulls in JSON strings. (https://github.com/protocolbuffers/protobuf/commit/37dfe806f84617390e9779fc237a0a77f5a50d6d)