Re: [slightlyoff/ServiceWorker] Declarative url filters in `fetch` event (#949)

I agree that we need data on the perf concerns and what might resolve them. I am similarly concerned that this isn't really a static declaration of routes. The registration of prefixes would be sent to the system every time we start the SW (and you might imagine, dynamically as `fetch` handlers are added). To really make something like this work I suspect you'd need to move the registration of the mapping to install time.

Can we close this issue for now?

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