That's called 'sum types' and that's what Go lacks. See some bikeshedding and ongoing discussion [here](https://github.com/golang/go/issues/57644 https://githu

That's called 'sum types' and that's what Go lacks. See some bikeshedding and ongoing discussion [here](https://github.com/golang/go/issues/57644 https://github.com/golang/go/issues/57644).