On Tuesday, March 15, 2016 at 12:32:07 PM UTC-7, Jeremy Ong wrote:
> 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?
Some alternatives to consider:
1. use a bytes field to store these data, and decode it manually if it's a 
2. use an google.protobuf.Any field for it if the data is still a protobuf 

> Best,
> Jeremy

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