recent versions of proto3 have added back the “optional” keyword that can be used on any field. see: https://github.com/protocolbuffers/protobuf/blob/main/docs/

recent versions of proto3 have added back the “optional” keyword that can be used on any field. see: https://github.com/protocolbuffers/protobuf/blob/main/docs/field_presence.md#presence-in-proto3-apis https://github.com/protocolbuffers/protobuf/blob/main/docs/f...