In the current Swift6 generator (and Swift5) with version 7.13.0-snapshot a non-standard class that conforms to Encodable is serialized by first converting it to JSON, and then base64-encoding the result.

Is this being used at all? It would seem much nicer to me if this was done explicitly by a user, and leave only the serialization of Data (byte arrays) to Base64 as a standard. Right now, this behavior is implicit whenever an object is passed into a request that uses it as a query parameter.