Re: [whatwg/fetch] Avoid using the CORS flag to reset request's origin in redirects (#594)

I suspect the problem with the preflight cache dates back from when I added support redirects following a successful preflight. I don't think I fully considered how the preflight cache should behave in cases where the request's origin was opaque.

Most performant would probably be to change the origin key into a byte sequence and use `null` if the tainted origin flag is set.

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