Re: [w3c/ServiceWorker] should FetchEvent.request ever be a range request if we cannot verify if the underlying resource is the same? (#1201)

That PR looks useful to clarify some things, but does it address the checking for change question?  Maybe firefox is more conservative here, but we never use range request unless we can have some assurance that we're continuing the same resource from before.  All the logic that enables that is in the http cache which sits below the service worker.

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