Hi google pb,

I was wondering if an interface exists for specifying that I do not want 
the proto3 serialization or deserialization to discard unknown fields. My 
understanding was that this change was made from proto2 to proto3, and is a 
pretty severe restriction if there are no ways around it. The motivating 
example in my case is to potentially decorate a message with fields in the 
extension ranges that are not part of the message body. The meaning is 
purely semantic and I do not want the data therein to be contained in the 
protobuf format itself. If unknown fields are not an option, are there 
other options or suggestions to handle this?


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