unittest_proto3 had been changed in a very backward-incompatible
way which was never going to work with C# as it imports proto2 messages.
This is now a copy of the old file, but with a package name change for
compatibility with the remaining files in src/google/protobuf.
The other moves are for files that are only used by C#.
- Change the default message hash code to 1 to be consistent with other code
- Change the empty list/map hash code to 0 as "empty map" is equivalent to "no map"
- Removed map fields from unittest_proto3.proto
- Created map_unittest_proto3.proto which is like map_unittest.proto but proto3-only
- Fixed factory methods in FieldCodec highlighted by using all field types :)
- Added tests for map serialization:
- Extra fields within entries
- Entries with value then key
- Non-contiguous entries for the same map
- Multiple entries for the same key
Changes to generated code coming in next commit
Jon Skeet
Jie Luo
Jon Skeet