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Thanks to @rdesgroppes for noticing that #82 causes issues for protos compiled from descriptor sets. The generated code always has json_name populated, which breaks things quite loudly.
This PR attempts to work around the issue by not relying exclusively on the presence of json_name. There's a new heuristic which checks whether the json_name matches the default json name computed from the field name. If so, we assume that it's not an explicit json_name and ignore it.
We could also revisit this behavior in the future if protocolbuffers/protobuf#5587 gets addressed
Rather than trying to compile protos from descriptor sets as part of the build, I just checked in a pre-compiled proto that was configured this way.