How to express union types in Kotlin? Union types, also known as sum types are a powerful language feature that I find myself using often in TypeScript something along the lines of: let a: string | number = “hello” a = 3 How would I achieve this type of behavior in kotlin? I saw some people talking about using inheritance and sealed classes to accomplish this but it looks like if you want to use that approach with primitives (such as String and Int) then one would have to write wrappers around those types to access the...