Re: [w3c/ServiceWorker] cache.addAll() is not consistent in aborting outstanding requests on error (#1543)

I guess if cache.addAll() aborts internally it is not exposed to the script's AbortSignal.  It seems the Request constructor always creates a new AbortSignal which then follows the original signal.  This means the signal flows into the new Request, but if we abort the new Request signal internally the info does not flow back out to the script.

So I'm not sure if its really possible to test if outstanding requests are cancelled when one request in addAll() fails.

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