Re: [ServiceWorker] Backpressure on fetch integrated with Streams (#452)

Exhaustive list of actions and events to consider.

Actions we can take that interacts with the stream of a Response are:

- `stream.read()`
- `res.text()`
- `respondWith(res)`
- `res.clone()`
- `new Response(res)`
- `cache.put(res)`

Events that may happen on a Response's stream are:

- `stream.read()`
    - called and returned empty ArrayBuffer
    - called and returned non-empty ArrayBuffer
- `res.text()`
    - called and is reading the stream
    - called and has finished reading the stream contents
        - read nothing
        - read at least 1 byte (i.e. the stream was not empty)
- `respondWith(res)`
    - ... same as above ...
- `res.clone()`
    - ... same as above ...
- `new Response(res)`
    - ... same as above ...
- `cache.put(res)`
    - ... same as above ...


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https://github.com/slightlyoff/ServiceWorker/issues/452#issuecomment-70792637