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

My current understanding is that `.bodyUsed == true` means that "someone is using the stream and you can't use it now". It is different from EOF, `.bodyUsed` turns true even if being read from `.text()` and `.bodyUsed` stays false when there are not data and the stream is closed but nobody used the stream yet.

We are talking about "stream lock" at https://github.com/whatwg/streams/issues/241, and my plan is that `.bodyUsed` is `stream.isLocked`.

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