Re: [fetch] Aborting a fetch (#27)

> Say this request is in progress and the user hits X in the browser UI, closes the tab, or navigates. The browser can cancel the stream once the promise it gets resolves, but it cannot abort either fetch or the .json read of the first fetch.

There are probably other places where this same sort of thing applies, but for this particular case the browser has other mechanisms to cancel these operations.  At least, in gecko we do.

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