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

> Actually, I'm not sure. Doing a cache lookup synchronously seems bad, but perhaps that is what implementations do? That probably warrants a bit more investigation. One way to do it later in "main fetch" would be to check the value of _recursive_ I suppose, although that might still run into problems with HTTP authentication requests.

Cache lookup *should* be synchronous IMO as it relies on something controlled by the main thread, making it parallel would create either locks or unnecessary races.

Maybe keeping it where I put it is correct?

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