Re: [ServiceWorker] Returning a FetchPromise from fetch() (#625)

You don't need to create an alternate universe.  I outlined a good option earlier in IRC: Tasks can be Promises too, they just create a plain Promise when you call `.then()`/etc.  If you operate on it like it's a multicast object, it'll behave like one; you have a different API (`.pipe()`, which is otherwise identical to `.then()`) for when you want to preserve the dangerous parts and treat it like unicast.  (You can fiddle with details there; `.pipe()` could ref-count and be callable multiple times, or maybe it's single-call and you have to clone explicitly; whatever.)

(I haven't read your previous post yet; feedback probably incoming.)

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