Re: [whatwg/fetch] consider adding note that CORS preflight check excludes headers added by the browser or extensions (#1005)

+1 for adding a note at least. I think it could avoid significant confusion, both on the implementation side (it's not clear currently from the spec that browsers are allowed to add additional CORS preflight-bypassing headers) and from the server operator side (it's not clear currently that your server could get hit by non-CORS-safelisted headers set by the browser).

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