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

(A) looks pretty good to me. (B) is not too bad---I could add `getReader({ preventReleaseOnClose: true })`---but it does feel like it is overloading "locked" to mean too many things.

In terms of user-observable consequences, I think (A) allows you to check `req.body.state === "closed"` after `fetch(req)` finishes consuming it, whereas (B) causes it to throw.

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