Re: [ServiceWorker] Background caching (#574)

> Edit: Not quite true. Cache.put will complete without a SW. Cache.add is essentially a fetch + cache.put so if the SW dies before the fetch completes then cache.put won't be called.

For posterity, gecko also treats Cache.add() as a service-worker-side fetch+put.  We hold the service worker alive until it completes, however.  This is largely due to implementation details, but also makes the developer experience more consistent.

I just wanted to note this as it may create different and unexpected behavior for people trying to figure out different service worker caching strategies.

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https://github.com/slightlyoff/ServiceWorker/issues/574#issuecomment-148105937