Protocol Buffers 27.0

What's new in this version:

Compiler:
- Future-proof edition 2023 against feature value support windows
- Mark deleted fields in descriptor.proto reserved
- Add extension declarations for known features
- Refactored the Java generator into separate packages and targets
- Officially release Editions in 27.0
- Define lifetimes of edition 2023 features
- Implement feature lifetime validation in protoc and the C++ runtime
- Add edition lifetime options for feature specs
- Enable editions support for Java Lite
- Release edition defaults CLI arguments
- Update protoc release to include editions language features protos for Java and C++

C++:
- Future-proof edition 2023 against feature value support windows
- Prohibit using features in the same file they're defined in
- Fix validation checks of implicit presence
- Clarify map behaviors in editions
- Ensure we allocate overaligned types with aligned operator new
- Fix text-format delimited field handling.(29c69ff)
- In debug mode, after clearing oneof messages on arenas, poison them if ASAN
- Allow string_type for Edition 2023
- Breaking change: Ensure we allocate overaligned types with aligned operator new
- Python JSON parser: Ignore invalid enum string values if ignore_unknown_fields is set
- Move java_features.proto to java/core/srce/main/resources
- Add an RAII namespace printer helper for C++ codegen
- Enable editions support for Java Lite
- Add an RAII ifndef helper for C++ codegen
- Clear oneof message fields even on arena on non-OPT builds
- Implement edition 2023 support in all Ruby runtimes
- Release edition defaults CLI arguments
- Deprecate Arena::CreateMessage for OSS
- Open sourcing reflection_visit_fieds
- Fixed the use of c++ keywords within namespace names
- Fix pkg-config metadata for shared abseil on windows
- Add GetStringView() and GetRepeatedStringView() with scratch
- Avoid a 'may be used uninitialized' warning when built with '-c opt'
- Add software prefetch to ByteSizeLong
- Add prefetching in arena blocks
- Rename the includingDefaultValueWithoutPresenceFields and always_print_without_presence_fields to alwaysPrintFieldsWithNoPresence in the C++, Py and Java JSON serializers for consistency
- Remove tags for arena cleanup nodes now that we have dedicated string cleanup blocks
- Avoid unused-parameter warning in field accessor listeners
- Add new always_print_without_presence_fields option to the C++ JSON serializer
- Fail to build descriptor if ctype is specified for non string/bytes fields
- Check ctype() in DescriptorBuilder for edition 2023 and beyond
- Fail building descriptors if ctype is used for fields other than string or bytes
- Fix generation of HasExtension and ExtensionSize functions to restrict to the
- Add the privacy manifest to the C++ CocoaPod

Java:
- Lazily resolve features for proto2 and proto3 for compatibility with old open source gencode that does not invoke feature resolution from gencode static init
- Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java
- Deprecate building from source with Maven to be removed in 4.28.x
- Split bootstrapped java_features.proto to keep it from leaking out
- Refactored the Java generator into separate packages and targets
- Define lifetimes of edition 2023 features
- Check that size is non-negative when reading string or bytes in StreamDecoder
- Fix text-format delimited field handling
- Move java_features.proto to java/core/srce/main/resources
- Add java_features.proto to kotlin_mvn release
- Enable editions support for Java Lite
- Fix descriptor to access type via getType() s.t. messages using delimited encoding are consistently treated as groups for Java lite
- Make UnsafeByteOperations stable; removing experimental annotation
- Fix features inheritance of oneof fields and extensions and fix/move unit tests to actually run
- Add software prefetch to ByteSizeLong
- Rename the includingDefaultValueWithoutPresenceFields and always_print_without_presence_fields to alwaysPrintFieldsWithNoPresence in the C++, Py and Java JSON serializers for consistency
- Add a new includingDefaultValueWithoutPresenceFields option to the Java parser which is intended to replace the current includingDefaultValueFields

Kotlin:
- Add java_features.proto to kotlin_mvn release

Csharp:
- Regenerate stale files
- Optimize JSON parsing in JsonTokenizer
- Avoid string concatenation when looking up enum values by name
- Cache StringBuilder instances in the .NET JsonTextTokenizer
- Enable Editions in the C# generator
- Runtime support for Protobuf Editions in C#
- Tweak "group to property name" mapping for C#. Under editions, where fields using a delimited encoding have independent field names from type names, we want to use the specified field name
- Ignore invalid enum string values in JSON, when invalid fields are being ignored

Objective-C:
- Optimize startup be reducing selector lookup
- Add the privacy manifest to the ObjC CocoaPod

Python:
- Add temporary alias for system_python.bzl at previous location
- Implement feature lifetime validation in protoc and the C++ runtime
- Fix text-format delimited field handling
- Python JSON parser: Ignore invalid enum string values if ignore_unknown_fields is set
- Fix upb python: DO NOT create empty optional field after sorting empty repeated field
- Enable Protobuf Python version check
- Register Scalar/MessageMapContainerTypes as virtual subclasses of MutableMapping instead of inheriting directly
- Rename the includingDefaultValueWithoutPresenceFields and always_print_without_presence_fields to alwaysPrintFieldsWithNoPresence in the C++, Py and Java JSON serializers for consistency
- Add new including_default_value_without_presence_fields to Python JSON serializer
- Adhere to PEP 8

PHP:
- Don't break the trace
- Fix inconsistent timestamp json encode/decode
- Feat: more readable phpdoc escaping

PHP C-Extension:
- Regenerate stale files
- See also UPB changes below, which may affect PHP C-Extension

Ruby:
- Add bigdecimal to dependencies
- Implement service & method descriptor lookup in Ruby
- Implement edition 2023 support in all Ruby runtimes
- Ruby implement memsize functions for native types
- Moved ObjectCache into an internal module
- [Ruby] Delegate difference, intersection, union from RepeatedField to Array
- Move the RubyMessage.java JSON "include defaults" to use alwaysPrintFieldsWithNoPresence
- Increased the size of the error message buffer by 4x, to 511 bytes

Ruby C-Extension:
- Regenerate stale files
- Implement service & method descriptor lookup in Ruby
- Implement edition 2023 support in all Ruby runtimes
- Ruby implement memsize functions for native types
- Moved ObjectCache into an internal module
- See also UPB changes below, which may affect Ruby C-Extension.
- UPB
- Regenerate stale files
- Setup upb installation with cmake
- Fix text-format delimited field handling
- Print non-extension fields by field number order instead of .proto file order
- Implement service & method descriptor lookup in Ruby
- Implement edition 2023 support in all Ruby runtimes
- Adds mutable extension accessors to the codegen for upb C for getting mutable extension messages
- Ruby implement memsize functions for native types
- Increased the size of the error message buffer by 4x, to 511 bytes

Other:
- MODULE.bazel fixes for protobuf BCR release
- Fix whitespace merge issue in gencode
- Work around windows path length limitations by moving immutable -> full in open source
- Move the windows path length workarounds out of protobuf-ci
- Update src/file_lists.cmake for staleness
- Add system_python to protobuf_deps.bzl
- Migrate bazel tests to protobuf-ci
- Fix bazel cache issues in 7.0.0
- Add redirects for C++ and Java proto rules
- Add redirects for proto rules
- Feat: automate publishing releases to Bazel Central Registry
- Add PrivacyInfo.xcprivacy