Protobuf has somewhat recently added the 'oneof' feature which tries to deal with these union types. The one downside I found when trying to use it was that th

Protobuf has somewhat recently added the 'oneof' feature which tries to deal with these union types. The one downside I found when trying to use it was that the 3rd-party C# Protobuf libraries didn't yet support it. See: https://developers.google.com/protocol-buffers/docs/proto#oneof https://developers.google.com/protocol-buffers/docs/proto#on...