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Best bet is likely https://github.com/protocolbuffers/protobuf/blob/main/docs/field_presence.md https://github.com/protocolbuffers/protobuf/blob/main/docs/f...,
by akshayshah 2y ago
Best bet is likely https://github.com/protocolbuffers/protobuf/blob/main/docs/field_presence.md https://github.com/protocolbuffers/protobuf/blob/main/docs/f..., which predates editions.