`ProtobufConverter`: representing `oneof` fields as unions is inconsistent with other implementations

[mdub]

When faced with a Protobuf schema that uses oneof fields, such as:

message SampleMessage {
  oneof test_oneof {
    string name = 4;
    SubMessage sub_message = 9;
  }
}

the ProtobufConverter generates a union struct. When the resulting SchemaAndValue is serialized, e.g. to JSON, the "oneof field" will be represented in the structure, e.g.

{
  "test_oneof": {
    "name": "Bob Dobbs"
  } 
}

This is inconsistent with most other implementations of Protobuf → JSON serialization, which do not "box" oneof field-sets in this way. For example, println(sampleMessage.toJson()) would typically yield simply:

{
  "name": "Bob Dobbs" 
}

[mdub]

I'm wondering whether the "boxing" behaviour (i.e. generation of a union struct per oneof) could be made configurable, so that we could opt out.

[mdub]

Hi @rayokota. I notice this issue has been closed, but your PR to fix it has not yet been merged. Any update on when it might be merged, and released?

[rayokota]

Sorry, closed prematurely, it will be merged toward the end of Sept