Re: [whatwg/fetch] Vary HTTP cache on credentials mode (#307)

Basically without this any site that uses `Access-Control-Allow-Origin: *` and doesn't use `Vary` for any credentials is vulnerable (assuming the browser in question supports `Vary` adequately for such scenarios to begin with). I don't think that's a responsible setup, especially as we require sites to go to great lengths to expose credentialed data through CORS precisely because such data is so sensitive.

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