That's one of my root annoyances with Go's type system: it lacks sum types. Rust has sum types in the form of enums, and thus unions. People don't appreciate ho

That's one of my root annoyances with Go's type system: it lacks sum types. Rust has sum types in the form of enums, and thus unions. People don't appreciate how useful sum types are until they need them, and then they discover how much easier they make things.