Re: [whatwg/fetch] Integrate with Fetch Metadata. (#993)

> As Yoav once discovered, this does not work. As https://fetch.spec.whatwg.org/#cors-unsafe-request-header-names is currently invoked, setting Sec- headers before the network layer forces a preflight. We'd have to add an exception there (or its caller).

Would you like me to put these headers specifically into https://fetch.spec.whatwg.org/#cors-safelisted-request-header? Or would you like us to work out a `Sec-*` carveout generally?

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