Re: [slightlyoff/ServiceWorker] Reporting URL for SW update failures (#877)

This would be very useful. Is there some reason this could not also trigger an event sent to one/all the current sw clients. My use case is that users with a cookie longer than 4096 bytes get a 400 when requesting our sw (I'm working on a fix for this elsewhere too), and for each of those users I would like an API to detect this and unregister the service worker.

In a similar vein, an interface for handling failed registrations would be useful: am I right in thinking `navigator.serviceWorker.register()` doesn't reject if the request for the service worker fails?

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