Re: [w3c/ServiceWorker] Difference between disk and memory cache (#1174)

The img cache is spec'd to come before service worker. Unfortunately, other memory caches, such as `<link rel=preload>` aren't spec'd, but I expect them to behave like `<img>` in terms of their cache relative to the service worker. Namely:

* Their caches come before the service worker. As in, you'll get no fetch event if there's a cache hit.
* Fetches generated by these things will go through the service worker.

Closing in favour of https://github.com/whatwg/fetch/issues/354.

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