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

> Right, my specific concern was: given that some browsers apparently reserve the right to clear entries from the cache at their discretion.

Also, I believe there are different "Clear browsing data" options available to the user which allows a user to clear Cache but not IDB.

When does Workbox check expiration dates? Our experience has been that IDB latency is not reliably low enough to block time-sensitive operations, like serving requests. We put our expiration dates as a header in the cached response, and check the header when serving, to make sure the asset isn't expired. The IDB latency issue is discussed more in https://github.com/w3c/ServiceWorker/issues/1331.

Are there any other known use cases for `Cache` metadata besides the following?
- Informing cache cleanup
- Implementing cache entry expiration dates

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