📝Protobuf: updating message types

• int32, uint32, int64, uint64, bool are all compatible (+enum)

• sint32, sint64 are compatible

• string, bytes are compatible (as long as bytes are valid UTF-8)

• embedded messages are compatible with bytes (if bytes contain an encoded version of message)

• fixed32, sfixed32, fixed64, sfixed64 are compatible

• optional and repeated are compatible

• moving one/multiple optional fields into oneof is safe (as long as only one of the fields is present)

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• 📝 § Protobuf