Re: [ServiceWorker] Response or Promise<Response> is invalid Web IDL (#724)

The fact that promises don't appear in the distinguishability table is a bug, imo. // cc @heycam

That said, per spec you can in fact just write `Promise<Response>` and an incoming `Response` will get wrapped in a `Promise` via `Promise.resolve`.  The only reason you'd want to use the union is if you actually wanted different processing of some sort in the `Promise` and non-`Promise` cases.

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