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

@tomayac 

> or (ii) to have more metadata primitives in the Cache API?

I think it's pretty obvious that arbitrary metadata storage along with responses would have made workbox easier. I don't think anyone's saying otherwise.

You could equally say "implementing Ember would have been easier if the whole of Ember was already in the platform".

The issues we raised in the F2F are:

* Is it the right primitive to be adding to the platform?
* We keep adding extra arbitrary storage along with APIs. Is this a pattern we should continue. Right now it's odd that some APIs have it and some don't.
* Would it be better to do something lower level, like associating data across stores?
* Would a simpler (and faster) storage make this not-a-problem?

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