Announcements
* **This version includes breaking changes to: Cpp.**
* [Cpp] Migrate to Abseil's logging library. (https://github.com/protocolbuffers/protobuf/commit/a9f1ea6371c108876649f27a5940a59cc8594768)
* [Cpp] `proto2::Map::value_type` changes to `std::pair<const K, V>`. (https://github.com/protocolbuffers/protobuf/commit/46656ed080e959af3d0cb5329c063416b5a93ef0)
* [Cpp] Mark final ZeroCopyInputStream, ZeroCopyOutputStream, and DefaultFieldComparator classes. (https://github.com/protocolbuffers/protobuf/commit/bf9c22e1008670b497defde335f042ffd5ae25a1)
* [Cpp] Add a dependency on Abseil (10416)
* [Cpp] Remove all autotools usage (10132)
* [Cpp] Add C++20 reserved keywords
* [Cpp] Dropped C++11 Support
* [Cpp] Delete Arena::Init
* [Cpp] Replace JSON parser with new implementation
* [Cpp] Make RepeatedField::GetArena non-const in order to support split RepeatedFields.
* You can refer to our [migration guide](https://protobuf.dev/programming-guides/migration/) for details on what C++ code changes will be necessary to be compatible with 22.0.
* [Protobuf News](https://protobuf.dev/news/) may include additional announcements or pre-announcements for upcoming changes.
Compiler
* Breaking change: Migrate to Abseil's logging library. (https://github.com/protocolbuffers/protobuf/commit/a9f1ea6371c108876649f27a5940a59cc8594768)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Protoc: accept capital X to indicate hex escape in string literals (10757)
* Gracefully handle weird placement of linebreaks around comments (10660)
* Open up visibility for some compiler internals (10608)
* Protoc: validate reserved names are identifiers (10586)
* Protoc: validate custom json_name configuration (10581)
* Protoc: fix consistency with parsing very large decimal numbers (10555)
* Use protoc version for --version (10386)
* Fix for grpc.tools 17995 & protobuf 7474 (handle UTF-8 paths in argumentfile) (10200)
* Print full path name of source .proto file on error
* Include proto message type in the annotation comments.
* Maven artifact suffix format has changed to -RCN instead of -rc-N
C++
* Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (https://github.com/protocolbuffers/protobuf/commit/a594141cc408b972c9ffe2bcf14958174d0a4fe4)
* Add C++ support for retention attribute (https://github.com/protocolbuffers/protobuf/commit/8f882e7f3d0535760c46f8cdde9f40006e33e02a)
* Breaking change: Migrate to Abseil's logging library. (https://github.com/protocolbuffers/protobuf/commit/a9f1ea6371c108876649f27a5940a59cc8594768)
* No longer define no_threadlocal on OpenBSD (10610)
* CMake: Enable projects to set the C++ version (10464)
* Breaking Change: Add a dependency on Abseil (10416)
* Upgrade third_party/googletest submodule to current main branch (10393)
* Breaking Change: Remove all autotools usage (10132)
* CMake: use add_compile_options instead of add_definitions for compile options (10293)
* Fix 9947: make the ABI identical between debug and non-debug builds (10271)
* Allow for CMAKE_INSTALL_LIBDIR to be absolute (10090)
* Add header search paths to protobuf-c++ spec (10024)
* Cpp_generated_lib_linked support is removed in protoc
* Reduced .pb.o object file size slightly by explicitly instantiating
* Breaking Change: Add C++20 reserved keywords.
* Breaking Change: Dropped C++11 Support
* Fixed crash in ThreadLocalStorage for pre-C++17 compilers on 32-bit ARM.
* Clarified that JSON API non-OK statuses are not a stable API.
* Added a default implementation of MessageDifferencer::Reporter methods.
* Proto2::MapPair is now an alias to std::pair.
* Hide C++ RepeatedField::UnsafeArenaSwap
* Use table-driven parser for reflection based objects.
* Add ARM-optimized Varint decoding functions.
* Minor optimization for parsing groups
* Declare ReflectiveProtoHook class
* Reduce size of VarintParse code in protocol buffers, by calling the shared
* Avoid inlining some large heavily duplicated routines in repeated_ptr_field.h
* Add ReflectiveProtoHook to Reflection.
* Turns on table-driven parser for reflection based objects.
* Save code space by avoiding inlining of large-in-aggregate code-space MessageLite::~MessageLite destructor.
* Undefine the macro `linux` when compiling protobuf
* Reduce memory consumption of MessageSet parsing.
* Save code space by avoiding inlining of large-in-aggregate code-space MessageLite::~MessageLite destructor.
* Breaking Change: Delete Arena::Init
* Make a PROTOBUF_POISON/UNPOISON to reduce noise in the source
* Put alignment functions in "arena_align.h"
* Split off `cleanup` arena functions into "arena_cleanup.h"
* Fix signed / unsigned match in CHECK_EQ
* Kill Atomic<>. it's not pulling it's weight
* Move AllocationPolicy out of arena_impl, and unify arena_config for bazel
* Fix failure case in table-driven parser.
* Breaking Change: Replace JSON parser with new implementation
* Introduce the Printer::{SetRedactDebugString,SetRandomizeDebugString} private flags.
* Introduce global flags to control Printer::{SetRedactDebugString, SetRandomizeDebugString}.
* Proto3 string fields no longer trigger clang-tidy warning bugprone-branch-clone.
* Fix the API of DescriptorUpgrader::set_allow_unknown_dependencies to set to True always, and to populate into the DescriptorPool as well.
* Report line numbers consistently in text-format deprecated-field warnings.
* Fixed C++ code generation for protos that use int32_t, uint32_t, int64_t, uint64_t, size_t as field names.
* Annotate generated C++ public aliases for enum types.
* Change default arena max block size from 8K to 32K.
* Begin emitting semantic metadata for some C++ proto features. (https://github.com/protocolbuffers/protobuf/commit/2880fef06cb7443ba24dc1264ba9f02115407f2c)
Java
* Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (https://github.com/protocolbuffers/protobuf/commit/a594141cc408b972c9ffe2bcf14958174d0a4fe4)
* Use LazyStringArrayList directly in gencode. (https://github.com/protocolbuffers/protobuf/commit/e6dd59e6cdd16664d60f9e2c2ee97cf1effb4fa7)
* Add Java support for retention attribute (https://github.com/protocolbuffers/protobuf/commit/1325913afd65b39c268e5c4101d6b82f32957ae9)
* Expect fail when serialize inf and nan for Value.number_value in json format. fixes 11259 (https://github.com/protocolbuffers/protobuf/commit/ca1cb1ba80ef18f5dccfb5b6ee7fa623ba6caab5)
* Create a helper function that can make a mutable copy of any ProtobufList (https://github.com/protocolbuffers/protobuf/commit/56696066132560c5de9ca888a097ba570cda1910)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Remove unused package private class ProtobufLists. (https://github.com/protocolbuffers/protobuf/commit/b51c551e37b1036bf54ade9911d9a39aed879ab0)
* Mark UnmodifiableLazyStringList deprecated. UnmodifiableLazyStringList is unnecessary and will be removed in a future release. (https://github.com/protocolbuffers/protobuf/commit/9595cbbf9a1dbd03edaf3def50befd99b727642c)
* Make emptyList public and mark the public EMPTY field as deprecated. (https://github.com/protocolbuffers/protobuf/commit/c658e27529ccf4a000724ab3622f1b807c85449b)
* Enable Text format parser to skip unknown short-formed repeated fields. (https://github.com/protocolbuffers/protobuf/commit/6dbd4131fa6b2ad29b2b1b827f21fc61b160aeeb)
* Expose internal setExtension method for Kotlin (https://github.com/protocolbuffers/protobuf/commit/33d1070fc46ecb6189d57095bc483bc8637dc972)
* Mark default instance as immutable first to avoid race during static initialization of default instances. (10770)
* Add serialVersionUID to ByteString and subclasses (10718)
* Fix serialization warnings in generated code when compiling with Java 18 and above (10561)
* Fix Timestamps fromDate for negative 'exact second' java.sql.Timestamps (10321)
* Fix Timestamps.fromDate to correctly handle java.sql.Timestamps before unix epoch (10126)
* Performance improvement for repeated use of FieldMaskUtilmerge by caching
* Optimized Java proto serialization gencode for protos having many extension ranges with few fields in between.
* More thoroughly annotate public generated code in Java lite protocol buffers.
* Fixed Bug in proto3 java lite repeated enum fields. Failed to call copyOnWrite before modifying previously built message. Causes modification to already "built" messages that should be immutable.
* Fix Java reflection serialization of empty packed fields.
* Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
* Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
* Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
* Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
* Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.
* Fix bug in nested builder caching logic where cleared sub-field builders would remain dirty after a clear and build in a parent layer. https://github.com/protocolbuffers/protobuf/issues/10624
* Add exemplar variants of the Java Any.is() and Any.unpack() methods. (https://github.com/protocolbuffers/protobuf/commit/60b71498d70a5645324385269c518b95c8c2feb0)
* Use bit-field int values in buildPartial to skip work on unset groups of fields. (https://github.com/protocolbuffers/protobuf/commit/2326aef1a454a4eea363cc6ed8b8def8b88365f5)
* Maven artifact suffix format has changed to -RCN instead of -rc-N
Kotlin
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Expose internal setExtension method for Kotlin (https://github.com/protocolbuffers/protobuf/commit/33d1070fc46ecb6189d57095bc483bc8637dc972)
* Add missing `public` modifier to Kotlin generated code (10616)
* Add "public" modifier to Kotlin generated code (10599)
* Update rules_kotlin version (10212)
* Suppress deprecation warnings in Kotlin generated code.
* Kotlin generated code comments now use kdoc format instead of javadoc.
* Escape keywords in package names in proto generated code
* Add Kotlin enum int value getters and setters
Csharp
* Make the MergeFrom method of type ReadOnlySequence<byte> public (11124) (https://github.com/protocolbuffers/protobuf/commit/c4bac67464cfb52f998a2f942a85adedfad04895)
* Fix a bug in which a possibly invalidated swisstable reference is used. (https://github.com/protocolbuffers/protobuf/commit/5c5dcdd11728d62a69e53f7a80ec2db8e16c4230)
* Fix .NET Native AOT warnings in Protobuf reflection (11128) (https://github.com/protocolbuffers/protobuf/commit/c019a797492791093bccfb8404c90bf83761b3a4)
* Use forward slash instead of backslash in nuspec file (11449) (https://github.com/protocolbuffers/protobuf/commit/724250d6e34c2734c876cdfa7208716757a6d50d)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Expose internal setExtension method for Kotlin (https://github.com/protocolbuffers/protobuf/commit/33d1070fc46ecb6189d57095bc483bc8637dc972)
* Apply Obsolete attribute to deprecated enums and enum values in C generated code (10520)
* Fix 32-bit floating point JSON parsing of maximal values for C (10514)
* Retain existing array in RepeatedField.Clear (10508)
* Implement IComparable<Duration> for the Duration type (C) (10441)
* Implement correct map merging behavior for C (10339)
* Support indented JSON formatting in C (9391)
* Disambiguate generated properties in C (10269)
* Bugfix/issue 8101 (10268)
* Expose plugin protos for C (10244)
* Update to C 10 and upgrade code style (10105)
* Fix failing FieldMask.Merge for well-known wrapper field types (9602)
* Helper method on Any to allow an any to be unpacked more easily (9695)
Objective-C
* [ObjC] Mark classes that shouldn't be subclassed as such. (https://github.com/protocolbuffers/protobuf/commit/a185a6ea8a5cc1d85f8a91405a0fafd007207ca4)
* [ObjC] Boolean generation options support no value as "true". (https://github.com/protocolbuffers/protobuf/commit/7935932356b405c4f8962e1e5ac19db1afd753aa)
* [ObjC] Put out of range closed enum extension values in unknown fields. (https://github.com/protocolbuffers/protobuf/commit/903639c3287df7235537547d947cbbaf8da01feb)
* [ObjC] Raise the min OS versions (and required Xcode) (10652)
* [ObjC] Provide a protocol for GPBExtensionRegistry's lookup support. (10597)
* Mark the `syntax` on `GPBFileDescriptor` as deprecated. (https://github.com/protocolbuffers/protobuf/commit/c79832bddc3931d798d31d417238e4377f869c79)
* Add the concept of a "closed enum" and expose it from the `GPBEnumDescriptor`. (https://github.com/protocolbuffers/protobuf/commit/7bb699be43e230315cf23808eff28bd694df7c17)
Python
* Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (https://github.com/protocolbuffers/protobuf/commit/a594141cc408b972c9ffe2bcf14958174d0a4fe4)
* Soft deprecate python MessageFactory (https://github.com/protocolbuffers/protobuf/commit/c80e7efac72510a2bc3e9365520055f6d6656c1d)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Raise errors when serialize inf and nan for Value.number_value in json format. fixes 11259 (https://github.com/protocolbuffers/protobuf/commit/883ec1c3ef8be0bae01cf9ad74e1adde977afeec)
* Resolve 10949: use raise from in json_format.py (10966) (https://github.com/protocolbuffers/protobuf/commit/1e6f8761cd11796f8437f198499ef73aa7e8dc96)
* Allow reserved enums to be negative (https://github.com/protocolbuffers/protobuf/commit/1f58f1d7b83ec333ab6076bf2e76797dd8de3e45)
* Make generated python files compatible with Cython (11011) (https://github.com/protocolbuffers/protobuf/commit/9aa5272420f5c666f2dbaba0892b174004c56257)
* Raise KeyError in Python ServiceDescriptor.FindMethodByName (9592) (9998)
* Changes ordering of printed fields in .pyi files from lexicographic to the same ordering found in the proto descriptor.
* Adds GeneratedCodeInfo annotations to python proto .pyi outputs as a base64 encoded docstring in the last line of the .pyi file for code analysis tools.
* Fix message factory's behavior in python cpp extension to return same message classes for same descriptor, even if the factories are different.
* Add type annotation for enum value fields in enum classes.
* Update sphinx 2.3.1 to 3.0.4 (https://github.com/protocolbuffers/protobuf/commit/c1a42b34e56f8b7ac51c56a700c489b24de1c214)
* Added is_closed to EnumDescriptor in protobuf python (https://github.com/protocolbuffers/protobuf/commit/da9de8d4d4cb5d16cfee726e52d06e91846e3578)
Python C-Extension (Default)
* Add license file to pypi wheels. (https://github.com/protocolbuffers/upb/commit/92dbe4b8bbb026282111f4d45d01feed35209803)
* Append "ByDef" to names of message accessors that use reflection (https://github.com/protocolbuffers/upb/commit/b747edb830b0fab524e0063fb2e156c390405dfa)
* Implement upb_Map_Next() as the new upb_Map iterator (https://github.com/protocolbuffers/upb/commit/03b1dee5cc8339fa60d45c2b3038f6141201bd19)
* Move the wire type definitions into upb/wire/ where they belong (https://github.com/protocolbuffers/upb/commit/ff6439fba0ff16b54150a1eb4ef511c080f3cb13)
* Replace and repair the integer hash table iterator: (https://github.com/protocolbuffers/upb/commit/70566461f97d1f03ed32ffe9f03aa126b721ed3a)
* Add Parse/Serialize templates to support shared_ptr/unique_ptr. (https://github.com/protocolbuffers/upb/commit/d3ec4b63c9f5fd6858580f8d19e41eaaaccf9fd7)
* Fixes https://github.com/protocolbuffers/upb/issues/869 (https://github.com/protocolbuffers/upb/commit/41017ef8dc3d03e1ac8c24820ad8ed9aca522bef)
* Silently succeed when adding the same serialized file in Python (https://github.com/protocolbuffers/upb/commit/e779b9d90aa8f8df7117c0f1870a158d54ab8d95)
* Different message factories will return same message class for same descriptor in python. (https://github.com/protocolbuffers/upb/commit/470f06cccbf26f98dd2df7ddecf24a78f140fe11)
* Make upb numpy type checks consistent with pure python and cpp. (https://github.com/protocolbuffers/upb/commit/79b735a7d720bd982d6dd9f0ced287d2e2c91b46)
* Upb: fix NULL pointer bug in Python FFI (https://github.com/protocolbuffers/upb/commit/c2c6427f606b7feb17a1c1f85ecd747a39978b3d)
* *See also UPB changes below, which may affect Python C-Extension (Default).*
PHP
* Drop support for PHP <7.4
* Fix: php 8.2 dynamic property warning in MapFieldIter (11485) (https://github.com/protocolbuffers/protobuf/commit/8e636d53e9aee98bc775e44bb38f1a103624816a)
* Chore: fix php lint (11417) (https://github.com/protocolbuffers/protobuf/commit/ade256e153ea7bfff85987a7f1bf2e9c9632cb10)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* [PHP]Added missing files and fix phpext_protobuf_ptr export in pecl version (10689)
* [PHP] Fix empty message serialization for Any (10595)
* [PHP] allow dynamic properties in Message (10594)
* [PHP] Added getContainingOneof and getRealContainingOneof to descriptor. (10356)
* Fix: PHP readonly legacy files for nested messages (10320)
* Migrating macos php builds from 7.0/7.3 to 7.4/8.0 (10274)
* Exposed more functions in FieldDescriptor and OneofDescriptor. (10102)
* Fixed PHP SEGV by not writing to shared memory for zend_class_entry. (9995)
* Feat: [PHP] remove legacy generate class file (9621)
PHP C-Extension
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Update PHP and Ruby to use the new accessors, delete the old ones (https://github.com/protocolbuffers/protobuf/commit/3f36a914427aecaa620f777c9aa5d49bd23592ee)
* Update Ruby to use the newer upb_Map_Next() iterator (https://github.com/protocolbuffers/protobuf/commit/8809a113bc0a00b685b787a03d0698aa8c3e10e8)
* Fix the ruby and php builds which were broken by a recent upb change (https://github.com/protocolbuffers/protobuf/commit/9cdf347d1977d328754c1e03f43f06dfa7887d51)
* *See also UPB changes below, which may affect PHP C-Extension.*
Ruby
* For Ruby oneof fields, generate hazzers for members (11655) (https://github.com/protocolbuffers/protobuf/commit/d1a3c6d08b3238415cb5c08609f42d88d9b227d3)
* Migrate ruby release targets to genrule to work around Bazel 5 bug (11619) (https://github.com/protocolbuffers/protobuf/commit/e207bcd940400fd8b99b838aae1117f1860ff495)
* Add ruby release targets (11468) (https://github.com/protocolbuffers/protobuf/commit/5b27b4f300c9c8fdb1f178151ef29a22a674d184)
* Remove support for ruby 2.5. (https://github.com/protocolbuffers/protobuf/commit/49589719e241a83d82ce67139006d2a9be391fce)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Update PHP and Ruby to use the new accessors, delete the old ones (https://github.com/protocolbuffers/protobuf/commit/3f36a914427aecaa620f777c9aa5d49bd23592ee)
* Replace libc strdup usage with internal impl to restore musl compat. (10811)
* Auto capitalize enums name in Ruby (10454)
* Ruby: Use class inheritance to save memory (10281)
* Ruby: use a valid instance variable name for `descriptor` (10282)
Ruby C-Extension
* For Ruby oneof fields, generate hazzers for members (11655) (https://github.com/protocolbuffers/protobuf/commit/d1a3c6d08b3238415cb5c08609f42d88d9b227d3)
* Add retention and target field options in descriptor.proto (https://github.com/protocolbuffers/protobuf/commit/5a5683781003c399a00d2ed210d4a5102ca65696)
* Add ruby release targets (11468) (https://github.com/protocolbuffers/protobuf/commit/5b27b4f300c9c8fdb1f178151ef29a22a674d184)
* Add debug_redact field option to protobuf. (https://github.com/protocolbuffers/protobuf/commit/9238c4843a1a25c588f11da5101c858f6ae6f7a8)
* Update PHP and Ruby to use the new accessors, delete the old ones (https://github.com/protocolbuffers/protobuf/commit/3f36a914427aecaa620f777c9aa5d49bd23592ee)
* Hide ruby native extension symbols on FreeBSD (10832) (https://github.com/protocolbuffers/protobuf/commit/2a73e3bdfbad01be6b88c5cfaa84f5cfcb072126)
* Update Ruby to use the newer upb_Map_Next() iterator (https://github.com/protocolbuffers/protobuf/commit/8809a113bc0a00b685b787a03d0698aa8c3e10e8)
* *See also UPB changes below, which may affect Ruby C-Extension.*
UPB (Python/PHP/Ruby C-Extension)
* Update protobuf commit (https://github.com/protocolbuffers/upb/commit/1fb480bc76bc0e331564d672e60b97a388aa3f76)
* Ensure that extensions respect deterministic serialization. (https://github.com/protocolbuffers/upb/commit/57a79de7cc34cc2ca4436483834aebd44e8f4f4b)
* Add ExtensionRegistry version of Parse to message templates. (https://github.com/protocolbuffers/upb/commit/28de62f4636ec6c271bf238a205684b8542b8f13)
* Fix Upb PromotoUnknownToMessage for OneOf fields. (https://github.com/protocolbuffers/upb/commit/10e57c038aef9154a4ddc03b627c4e5cbef9da04)
* Implement UPB OneOf MiniTable apis. (https://github.com/protocolbuffers/upb/commit/067dfeacfd02a9dedfa7fcfb1b1c2e8566cc8325)
* Remove reflection dependency for UPB compare utility. (https://github.com/protocolbuffers/upb/commit/84a3fd2d2d943c8ff37f09feadb1dd3f60f954ee)
* Expect fail when serialize inf and nan for Value.number_value in json format. fixes 11259 (https://github.com/protocolbuffers/upb/commit/651550cece034b8e3a6667e817ca654ab63dd694)
* Add ::protos::Parse template for Ptr<T>. (https://github.com/protocolbuffers/upb/commit/b5384af913af9f96784a4c5b8a166e23f507c0c4)
* Upb_Array_Resize() now correctly clears new values (https://github.com/protocolbuffers/upb/commit/02cf7aaa1d97bc5268639e56f735d2ec30e7c4ed)
* Fix unset mini table field presence bug (https://github.com/protocolbuffers/upb/commit/9ab09b47fad2d0673689236bbb2d6ee9dfee1fbd)
* Allow reserved enums to be negative (https://github.com/protocolbuffers/upb/commit/1b0b06f082508f1d6856550e8ddb9b8112922984)
* Fix UPB_LIKELY() for 32-bit Windows builds (https://github.com/protocolbuffers/upb/commit/9582dc2058e2f8a9d789c6184e5e32602758ed0d)
* Fix C compiler failure when there are fields names prefixed with accessor prefixes such as set_ and clear_. (https://github.com/protocolbuffers/upb/commit/d76e286631eb89b621be)
* Make upb backwards and forwards compatible with Bazel 4.x, 3.5.x and LTS (https://github.com/protocolbuffers/upb/commit/04957b106174080e839b60c07c3a4c052646102b)
Other
* Rename Maven artifacts to use “RC” instead of “rc-” as the release candidate prefix.
* Remove unused headers, include missing headers, match args, etc. (https://github.com/protocolbuffers/protobuf/commit/21a6a26d6736dfc2bf8e638e5054a3dc5f7fc2a5)
* Add a non-const overload of RepeatedPtrField::GetArena and deprecate the const overload. (https://github.com/protocolbuffers/protobuf/commit/4bf33da229156c60794c63bbd129cbae542d450b)
* Optimize Varint Parsing for 32 and 64 bits (https://github.com/protocolbuffers/protobuf/commit/ac76ae9a6b76104da66cd550acd9d04cc817a64a)
* Fix reflection based parser for map entries with closed enum values. (https://github.com/protocolbuffers/protobuf/commit/55d21239e950164f810f3e8c348ce5bf0d7537d6)
* Upgrade to Abseil LTS 20230117 (11622) (https://github.com/protocolbuffers/protobuf/commit/7930cd1f9d1ec9c6632ed29e9aede3c6ab362960)
* Fixed Visual Studio 2022: protobuf\src\google\protobuf\arena.cc(457,51): error C2127: 'thread_cache_': illegal initialization of 'constinit' entity with a non-constant expression 11672 (11674) (https://github.com/protocolbuffers/protobuf/commit/c2e99a1ee4df28261c2e3229b77b5d881b5db5db)
* Clean up a few issues with ARM-optimized varint decoding. (https://github.com/protocolbuffers/protobuf/commit/bbe2e68686d8517185f7bb67596f925b27058d34)
* Fix bool parser for map entries to look at the whole 64-bit varint and not just (https://github.com/protocolbuffers/protobuf/commit/43e5937bf65968f5cb4b17f2994dd65df849a7f3)
* Breaking Change: `proto2::Map::value_type` changes to `std::pair<const K, V>`. (https://github.com/protocolbuffers/protobuf/commit/46656ed080e959af3d0cb5329c063416b5a93ef0)
* Breaking Change: Mark final ZeroCopyInputStream, ZeroCopyOutputStream, and DefaultFieldComparator classes. (https://github.com/protocolbuffers/protobuf/commit/bf9c22e1008670b497defde335f042ffd5ae25a1)
* Deprecate repeated field cleared elements API. (https://github.com/protocolbuffers/protobuf/commit/84d8b0037ba2a7ade615221175571c7a9c4c6f90)
* Breaking change: Make RepeatedField::GetArena non-const in order to support split RepeatedFields. (https://github.com/protocolbuffers/protobuf/commit/514c9a8e2ac85ad4c29e2394f3480341f0df27dc)
* Add EpsCopyInputStream::ReadCord() providing an efficient direct Cord API (https://github.com/protocolbuffers/protobuf/commit/bc4c156eb2310859d8b8002da050aab9cd78dd34)
* Add static asserts to container classes. (https://github.com/protocolbuffers/protobuf/commit/5a8abe1c2027d7595becdeb948340c97e85e7aa7)
* Fix proto deserialization issue when parsing a packed repeated enum field whose (https://github.com/protocolbuffers/protobuf/commit/afdf6dafc224258c450b47c5c7fcbc9365bbc302)
* Use the "shldq" decoder for the specialized 64-bit Varint parsers, rather than (https://github.com/protocolbuffers/protobuf/commit/0ca97a1d7de4c8f59b4a808541ce7c555cc17f33)
* Use utf8_range to reference //third_party/utf8_range (11352) (https://github.com/protocolbuffers/protobuf/commit/2dcd7d8f70c9a9b5bed07b614eaf006c79a99134)
* Place alignas() before lifetime specifiers (11248) (https://github.com/protocolbuffers/protobuf/commit/5712e1a746abe0786a62014a24840dd44533422a)
* Add UnknownFieldSet::SerializeToCord() (https://github.com/protocolbuffers/protobuf/commit/8661e45075427162a962998279959bbabd11e0c8)
* Add support for repeated Cord fields. (https://github.com/protocolbuffers/protobuf/commit/b97005bda54f7f2a4e9791e0a5750bf39338ce89)
* Add Cord based Parse and Serialize logic to MessageLite (https://github.com/protocolbuffers/protobuf/commit/ddde013bd899702a1e78dd9e31a3e703bbb173b7)
* Add 'ReadCord` and 'WriteCord` functions to CodedStream (https://github.com/protocolbuffers/protobuf/commit/e5e2ad866c01804a56a11da97555a023eaf07a52)
* Add CordInputStream and CordOutputStream providing stream support directly from/to Cord data (https://github.com/protocolbuffers/protobuf/commit/8afd1b670a19e6af9af7a9830e365178b969bf57)
* Add a `WriteCord()` method to `ZeroCopyInputStream` (https://github.com/protocolbuffers/protobuf/commit/192cd096b18619d5ccd2d3b01b086106ec428d04)
* Unify string and cord cleanup nodes in TaggedNode (https://github.com/protocolbuffers/protobuf/commit/0783c82bb48fc60edc4d1d5b179b5ebdf8a36424)
* Open source google/protobuf/bridge/message_set.proto (https://github.com/protocolbuffers/protobuf/commit/c04f84261327bf1a2bd02c0db3c8538fd403d7e7)
* FileOutputStream: Properly pass block_size to CopyingOutputStreamAdaptor (https://github.com/protocolbuffers/protobuf/commit/1b1e399e2ec720cd93785ece148ec081255bd908)
* Implement ZeroCopyInputStream::ReadCord() in terms of absl::CordBuffer (https://github.com/protocolbuffers/protobuf/commit/75d31befc6475178d6c4cd920602c9709e714519)
* Changing bazel skylib version from 1.2.1 to 1.3.0 (10979) (https://github.com/protocolbuffers/protobuf/commit/1489e8d224741ca4b1455b02257c3537efe9f1c9)
* Update zlib to 1.2.13. (10786)
* Make jsoncpp a formal dependency (10739)
* Upgrade to MSVC 2017, since 2015 is no longer supported (10437)
* Update CMake configuration to add a dependency on Abseil (10401)
* Use release version instead of libtool version in Makefile (10355)
* Fix missing `google::protobuf::RepeatedPtrField<std::string>` issue in GCC (https://github.com/protocolbuffers/protobuf/commit/225b936c0183e98b7c5e072d9979c01f952c2d5a)