Fix protobuf merge when types have different descriptor instances #526
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When two proto messages have different descriptor instances it's not possible
to merge from one proto to the other without raising a
panic. The fallback strategyis to merge using the
proto.Marshalandproto.Unmarshalcalls to serialize to bytesfirst.
The existing
proto.Mergesemantics might benefit from relaxing their constraints,but I can see how in some cases the merge result might be undefined.