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

As an additional data point, [Workbox](https://developers.google.com/web/tools/workbox/), which is widely used in the industry, handles [cache expiration](https://developers.google.com/web/tools/workbox/reference-docs/latest/workbox.expiration.CacheExpiration) via IDB timestamps:

<img width="1046" alt="screenshot 2018-10-25 at 15 50 17" src="https://user-images.githubusercontent.com/145676/47505400-5e022080-d86e-11e8-9e04-d8899303444f.png">


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Received on Thursday, 25 October 2018 13:58:17 UTC