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

> Allowing arbitrary data to be stored with a response doesn't help this much. The data can easily get out of sync, although it's true both will be cleared at the same time.

Right, my specific concern was: given that some browsers apparently reserve the right to clear entries from the cache at their discretion. Developers storing request metadata in IDB will need to write extra code to account for that possibility.

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