Re: [whatwg/fetch] Integration with preload (PR #1342)

> When would we expect to use "allow preloads"? If it's just XHR and `fetch()` I think we have enough state on request to make that determination already.

Custom headers currently should disallow preloads, but also things like "synchronous XHR", which I don't know if we have the knowledge for at this point. 

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