Re: [whatwg/fetch] CORS preflights need a service-workers mode of "none" (#598)

I don't think this is technically needed because **CORS-preflight fetch** calls **HTTP-network-or-cache fetch**, whereas the service worker interception happens in **HTTP fetch**.

Redirects aren't an issue, because **HTTP-network-or-cache fetch** doesn't follow redirects. Well, it's an issue if CORS preflights are expected to follow redirects. Are they?

Setting this for safety seems fine, but maybe include a note to say it doesn't do anything right now?

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