Re: [heycam/webidl] Some things do not seem sound in “react to a Promise<T>” (#943)

I'm pretty sure that service workers rely on the type being enforced when an arbitrary promise is passed in (e.g., for `respondWith()`. And once we make ByteString map to a byte sequence and vice versa I could see it being useful for return values as well. I don't see why promises would be different from synchronous callbacks/functions.

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