[WorldMaker]

It sounds like they didn't reuse the enum keyword for this for the most backwards compatibility and to avoid confusion. Your example enum is an `int` today. Either you break existing code expecting an `int` sized thing or you need additional syntax and can't use the "clean" form that you are hoping for.

The null patterns predate these unions and the relevant section of the documentation is showing that you can use nullable unions, not that you have to or should use them. Other examples also show a fully closed Result<T, E> type that yeah would be great for projects hoping to eliminate more nullable code.