Re: [w3c/ServiceWorker] Allow caches to opt-in to granular cleanup (#863)

@wanderview, not sure if you were referencing my comment or just @asakusuma's, but I was basing my claim on [a post from the webkit.org blog](https://webkit.org/blog/8090/workers-at-your-service/):

> To keep only the stored information that is useful to the user, WebKit will remove unused service worker registrations after a period of a few weeks. Caches that do not get opened after a few weeks will also be removed. Web Applications must be resilient to any individual cache, cache entry or service worker being removed.

I'm not sure how often this actually happens in the wild though.

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