Yeah, that's the runtime perspective... but for the type system, they're different... with the "naked" union being much harder (as they're non-algebraic - `a |

Yeah, that's the runtime perspective... but for the type system, they're different... with the "naked" union being much harder (as they're non-algebraic - `a | b | b` always equals `a | b` and might even equal just `a` for some values of `a` and `b`)