[nielsbot]

I guess I just want to be able to do something like this in Swift:

    let x: String | Int
    
    switch x {
        case let value as String:
            // handle String value here
        case let value as Int:
            // handle Int value here
    }

There's one more thing about TypeScript-style union types: string literals. I think it's great to be able to do

    type Options = "option_1" | "option_2" ... "option_n"

And subsequently I could use

    let t: Options
    switch t {
        case "option_1":
            // handle `"option_1"` case here
        ...
        case "option_n":
            // handle `"option_n"` case here
    }

I think this is more programmer friendly than requiring an out-of-line definition of a new `enum`. Sometimes you just want to write some code, you know?