Re: [fetch] Add a bit to Opaque Responses to distinguish redirects (#79)

You can observe redirects with `fetch(url, {redirect:"error"})` too. I guess this helps in the case where you have `fetch(crossOriginURL, {mode:"no-cors"})` and there's potentially a redirect, because either way you'd get an opaque response back. And maybe in the `fetch(sameOriginURL, {mode:"no-cors"})` case if you're only looking at the response and not the url.

It seems safer however to use `fetch(url, {redirect:"error"})` as in that case you'll never get a response you didn't expect.

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