Ruby
* Dropped Ruby 2.3 and 2.4 support for CI and releases. (9311)
* Message.decode/encode: Add max_recursion_depth option (9218)
* Rename max_recursion_depth to recursion_limit (9486)
* Fix conversion of singleton classes in Ruby (9342)
* Suppress warning for intentional circular require (9556)
* JSON will now output shorter strings for double and float fields when possible
without losing precision.
* Encoding and decoding of binary format will now work properly on big-endian
systems.
* UTF-8 verification was fixed to properly reject surrogate code points.
* Unknown enums for proto2 protos now properly implement proto2's behavior of
putting such values in unknown fields.
Java
* Revert "Standardize on Array copyOf" (9400)
* Resolve more java field accessor name conflicts (8198)
* Don't support map fields in DynamicMessage.Builder.{getFieldBuilder,getRepeatedFieldBuilder}
* Fix parseFrom to only throw InvalidProtocolBufferException
* InvalidProtocolBufferException now allows arbitrary wrapped Exception types.
* Fix bug in `FieldSet.Builder.mergeFrom`
* Flush CodedOutputStream also flushes underlying OutputStream
* When oneof case is the same and the field type is Message, merge the
subfield. (previously it was replaced.)’
* Add CheckReturnValue to some protobuf types
* Report original exceptions when parsing JSON
* Add more info to deprecated javadoc for set/get/has methods
* Fix initialization bug in doc comment line numbers
* Fix comments for message set wire format.
Kotlin
* Add test scope to kotlin-test for protobuf-kotlin-lite (9518)
* Add orNull extensions for optional message fields.
* Add orNull extensions to all proto3 message fields.
Python
* Dropped support for Python < 3.7 (9480)
* Protoc is now able to generate python stubs (.pyi) with --pyi_out
* Pin multibuild scripts to get manylinux1 wheels back (9216)
* Fix type annotations of some Duration and Timestamp methods.
* Repeated field containers are now generic in field types and could be used
in type annotations.
* Protobuf python generated codes are simplified. Descriptors and message
classes' definitions are now dynamic created in internal/builder.py.
Insertion Points for messages classes are discarded.
* has_presence is added for FieldDescriptor in python
* Loosen indexing type requirements to allow valid __index__() implementations
rather than only PyLongObjects.
* Fix the deepcopy bug caused by not copying message_listener.
* Added python JSON parse recursion limit (default 100)
* Path info is added for python JSON parse errors
* Pure python repeated scalar fields will not able to pickle. Convert to list
first.
* Timestamp.ToDatetime() now accepts an optional tzinfo parameter. If
specified, the function returns a timezone-aware datetime in the given time
zone. If omitted or None, the function returns a timezone-naive UTC datetime
(as previously).
* Adds client_streaming and server_streaming fields to MethodDescriptor.
* Add "ensure_ascii" parameter to json_format.MessageToJson. This allows smaller
JSON serializations with UTF-8 or other non-ASCII encodings.
* Added experimental support for directly assigning numpy scalars and array.
* Improve the calculation of public_dependencies in DescriptorPool.
* [Breaking Change] Disallow setting fields to numpy singleton arrays or repeated fields to numpy
multi-dimensional arrays. Numpy arrays should be indexed or flattened explicitly before assignment.
Compiler
* Migrate IsDefault(const std::string*) and UnsafeSetDefault(const std::string*)
* Implement strong qualified tags for TaggedPtr
* Rework allocations to power-of-two byte sizes.
* Migrate IsDefault(const std::string*) and UnsafeSetDefault(const std::string*)
* Implement strong qualified tags for TaggedPtr
* Make TaggedPtr Set...() calls explicitly spell out the content type.
* Check for parsing error before verifying UTF8.
* Enforce a maximum message nesting limit of 32 in the descriptor builder to
guard against stack overflows
* Fixed bugs in operators for RepeatedPtrIterator
* Assert a maximum map alignment for allocated values
* Fix proto1 group extension protodb parsing error
* Do not log/report the same descriptor symbol multiple times if it contains
more than one invalid character.
* Add UnknownFieldSet::SerializeToString and SerializeToCodedStream.
* Remove explicit default pointers and deprecated API from protocol compiler
Arenas
* Change Repeated*Field to reuse memory when using arenas.
* Implements pbarenaz for profiling proto arenas
* Introduce CreateString() and CreateArenaString() for cleaner semantics
* Fix unreferenced parameter for MSVC builds
* Add UnsafeSetAllocated to be used for one-of string fields.
* Make Arena::AllocateAligned() a public function.
* Determine if ArenaDtor related code generation is necessary in one place.
* Implement on demand register ArenaDtor for InlinedStringField
C++
* Enable testing via CTest (8737)
* Add option to use external GTest in CMake (8736)
* CMake: Set correct sonames for libprotobuf-lite.so and libprotoc.so (8635) (9529)
* Add cmake option `protobuf_INSTALL` to not install files (7123)
* CMake: Allow custom plugin options e.g. to generate mocks (9105)
* CMake: Use linker version scripts (9545)
* Manually *struct Cord fields to work better with arenas.
* Manually destruct map fields.
* Generate narrower code
* Fix https://github.com/protocolbuffers/protobuf/issues/9378 by removing
shadowed _cached_size_ field
* Remove GetPointer() and explicit nullptr defaults.
* Add proto_h flag for speeding up large builds
* Add missing overload for reference wrapped fields.
* Add MergedDescriptorDatabase::FindAllFileNames()
* RepeatedField now defines an iterator type instead of using a pointer.
* Remove obsolete macros GOOGLE_PROTOBUF_HAS_ONEOF and GOOGLE_PROTOBUF_HAS_ARENAS.
PHP
* Fix: add missing reserved classnames (9458)
C
* Fix trim warnings (9182)
* Fixes NullReferenceException when accessing FieldDescriptor.IsPacked (9430)
* Add ToProto() method to all descriptor classes (9426)
* Add an option to preserve proto names in JsonFormatter (6307)
Objective-C
* Add prefix_to_proto_package_mappings_path option. (9498)
* Rename `proto_package_to_prefix_mappings_path` to `package_to_prefix_mappings_path`. (9552)
* Add a generation option to control use of forward declarations in headers. (9568)