Re: [ServiceWorker] Define some way for foreign fetch to decide on opaqueness of responses (#841)

I mean the return of `foreignFetchEvent.makeVisibleTo()` is a wrapper around the new response. I'm trying to avoid creating yet another response type, especially one that's only useful between calling `foreignFetchEvent.makeVisibleTo()` and `foreignFetchEvent.respondWith()` checking it.

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https://github.com/slightlyoff/ServiceWorker/issues/841#issuecomment-189256544