Re: [w3c/ServiceWorker] Support restarting download when storing large resources in Cache (#713)

Has the concept of caching partial content responses been revisited? Im interested in the following concepts specifically: 
- storing partial content responses in a cache, 
- appending additional partial responses to the cache entry, 
- and retrieving partial content responses using requests with Range headers

We have a use-case that requires all three of these and currently don't see any way to implement this using the current API semantics. 

There's an example [here](https://samdutton.github.io/samples/service-worker/prefetch-video/) that shows how to read a partial content response from a complete entry, but this sadly isn't sufficient for us.

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