Planned Future Changes

• Make C++ implementation C++11 only: we plan to require C++11 to build protobuf code starting from 3.6.0 release, after unknown fields semantic changes are finished. Please join this github issue to provide your feedback.

protoc

• Fixed a bug introduced in 3.5.0 and protoc in Windows now accepts non-ascii characters in paths again.

C++

• Removed several usages of C++11 features in the code base.
• Fixed some compiler warnings.

PHP

• Fixed memory leak in C-extension implementation.
• Added discardUnknokwnFields API.
• Removed duplicatd typedef in C-extension headers.
• Avoided calling private php methods (timelib_update_ts).
• Fixed Any.php to use fully-qualified name for DescriptorPool.

Ruby

• Added Google_Protobuf_discard_unknown for discarding unknown fields in
  messages.

C#

• Unknown fields are now preserved by default.
• Floating point values are now bitwise compared, affecting message equality check and Contains() API in map and repeated fields.