This version introduces a new package protodelim to marshal and unmarshal size-delimited messages.
It also brings the implementation up to date with the latest protobuf features.
CL/462315: cmd/protoc-gen-go: make deprecated messages more descriptive
CL/473015: encoding/prototext: allow whitespace and comments between minus sign and number in negative numeric literal
Alignment with protobuf
CL/426054: types/descriptorpb: update *.pb.go to use latest protoc release, 21.5
CL/425554: encoding/protojson: fix parsing of google.protobuf.Timestamp
CL/461238: protobuf: remove the check for reserved field numbers
CL/469255: types/descriptorpb: regenerate using latest protobuf v22.0 release
CL/472696: cmd/protoc-gen-go: support protobuf retention feature
Documentation improvements:
CL/464275: proto: document Equal behavior of invalid messages
CL/466375: all: update links to Protocol Buffer documentation
Minor performance improvements
CL/460215: types/known/structpb: preallocate map in AsMap
CL/465115: internal/strs: avoid unnecessary allocations in Builder
Breaking changes
CL/461238: protobuf: remove the check for reserved field numbers
protowire.(Number).IsValid() no longer returns false for reserved fields because reserved fields are considered semantically valid by the protobuf spec.
Configuration
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