Comment by kenshaw

Thanks for the input -- this actually does support enums, using a variant of Go's const:

    type MyEnum int

    const (
        MYENUMVAL MyEnum = iota
    )

It's a philosophical argument, but one should not design a protocol using "oneof". I believe that's a relic from proto2, and I'm not aware of any modern APIs published by Google, that make use of "oneof" in anything but a legacy capacity. Gunk is not for old protobufs, it's for new development. It works with and integrates cleanly with existing protobuf definitions.