Sourced from protobuf-java's releases.

Protocol Buffers v3.18.0

C++

• Fix warnings raised by clang 11 (#8664)
• Make StringPiece constructible from std::string_view (#8707)
• Add missing capability attributes for LLVM 12 (#8714)
• Stop using std::iterator (deprecated in C++17). (#8741)
• Move field_access_listener from libprotobuf-lite to libprotobuf (#8775)
• Fix #7047 Safely handle setlocale (#8735)
• Remove deprecated version of SetTotalBytesLimit() (#8794)
• Support arena allocation of google::protobuf::AnyMetadata (#8758)
• Fix undefined symbol error around SharedCtor() (#8827)
• Fix default value of enum(int) in json_util with proto2 (#8835)
• Better Smaller ByteSizeLong
• Introduce event filters for inject_field_listener_events
• Reduce memory usage of DescriptorPool
• For lazy fields copy serialized form when allowed.
• Re-introduce the InlinedStringField class
• v2 access listener
• Reduce padding in the proto's ExtensionRegistry map.
• GetExtension performance optimizations
• Make tracker a static variable rather than call static functions
• Support extensions in field access listener
• Annotate MergeFrom for field access listener
• Fix incomplete types for field access listener
• Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They record the map items which are different in MessageDifferencer's reporter.
• Reduce binary size due to fieldless proto messages
• TextFormat: ParseInfoTree supports getting field end location in addition to start.
• Fix repeated enum extension size in field listener
• Enable Any Text Expansion for Descriptors::DebugString()
• Switch from int{8,16,32,64} to int{8,16,32,64}_t

Java

• Fix errorprone conflict (#8723)
• Removing deprecated TimeUtil class. (#8749)
• Optimized FieldDescriptor.valueOf() to avoid array copying.
• Removing deprecated TimeUtil class.
• Add Durations.parseUnchecked(String) and Timestamps.parseUnchecked(String)
• FieldMaskUtil: Add convenience method to mask the fields out of a given proto.

JavaScript

• Optimize binary parsing of repeated float64
• Fix for optimization when reading doubles from binary wire format
• Replace toArray implementation with toJSON.

PHP

• Migrate PHP & Ruby to ABSL wyhash (#8854)
• Added support for PHP 8.1 (currently in RC1) to the C extension (#8964)
• Fixed PHP SEGV when constructing messages from a destructor. (#8969)

... (truncated)

• 89b14b1 Update change log (#8974)
• 12fb2b7 Update protobuf version (#8973)
• ac02d6c Merge pull request #8970 from haberman/ruby-repeated-plus-arena
• 39dc8ad Merge pull request #8969 from haberman/php-destructor2
• 26e0ee8 Fixed multirequest.sh script for when nohup.out does not exist.
• 66a3e1a Added missing file to EXTRA_DIST.
• 79ac88b Fixed a memory bug with RepeatedField#+.
• 759a539 Fixed PHP SEGV when constructing messages from a destructor.
• 605ab95 Merge pull request #8964 from haberman/php-8.1
• 44df0ab Added support for PHP 8.1 (currently in RC1).
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