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

@philipwalton

> Having data for the same request stored in multiple places makes it much easier for that data to get out of sync

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.

> In addition to cache expiration, there are other use cases for making Request/Response objects structured cloneable and easily storable in IDB. Right now we have to do a fair amount of work to extract all the data from a request (including reading the body as a Blob) so it can be stored in IDB and retried during a sync event.

Agreed. This would be useful for background fetch too.

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