Re: [ServiceWorker] Allowing multiple scopes (& should scopes be primary key?) (#566)

> Optional: allow ServiceWorkers to be created that don't care about fetch events

It seems to me this goal can already be mostly met by the UA optimizing around the `onfetch` handler not being set.  If there are no fetch event handlers then the UA can skip network interception completely.  This state would need to be persisted when the SW shutdown.



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