Re: [w3c/ServiceWorker] ready promise is kind of weird with overlapping scopes (#1278)

@wanderview,

> The implication of the current spec text is that you can get a registration with a .installing worker, but not active yet and start waiting. If the registration fails to install and goes away, though, you are stuck with ready pointing at this dead registration.

I think the returned ready promise would be resolved by some later access to `.ready` that would end up a successful installation. But I agree that the step waiting for it to activate is flawed. I'm working on https://github.com/w3c/ServiceWorker/pull/1277 that would address this problem.

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