Well, for example, try/catch don't work asynchronously, so you can't pass it to a callback (or use it in a SignalProducer in RAC). If failure/success is Just An

Well, for example, try/catch don't work asynchronously, so you can't pass it to a callback (or use it in a SignalProducer in RAC). If failure/success is Just Another Value, it works everywhere that values work. That they already use an ADT for nullability it what confuses me - ".None, but with an error" isn't a far off concept from that. antitypical/Result already provides Result.init(() throws -> T) -> Result<T, E>, so it's easy enough to work around, at least. The magic variable stuff exists in didSet as well, weird and sketchy to use. Would prefer it to be explicit in all cases.