I just ran into this while trying to write a gRPC service that can handle 
forward and back compatibility.

So say that a new service is running with new fields in its proto3 message 
and it returns this to an older client. The older client is supposed to 
receive it, modify one or two fields and then send it back to update the 

It seems that with proto3 the new fields are just being erased when the 
older client sends back an older message.

What is the solution to this?

On Wednesday, December 10, 2014 at 9:51:01 PM UTC-7, Feng Xiao wrote:
> 2. Removal of unknown fields.

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