Challenge: Flattening nested optionals

[aemino]

func flatten(_ opt: Any?) -> Any? {
  guard let unwrapped = opt else {
    return nil
  }

  if Mirror(reflecting: unwrapped).displayStyle == .optional {
    return flatten(Mirror(reflecting: unwrapped).children.first!.value)
  } else {
    return Optional(unwrapped)
  }
}

I think this will do it. I feel a bit dirty after writing this, but hey, it seems to do the job. Let me know if it does/doesn't work, it's late and I'm going to go to bed now.

I ended up using Mirror to avoid having to create a protocol, but a protocol-based solution may be more desirable if you want "vanilla" Swift code. Perhaps there exists a way to do this without either caveat!