Re: [whatwg/fetch] Add `range` to CORS-safelisted request-headers (#1310)

I tripped over this just recently in attempting to use https://github.com/phiresky/sql.js-httpvfs, which makes use of range requests - I checked that the place I was `fetch`ing (github pages) supported cross-origin GETs (it returns `access-control-allow-origin: *` for a non-preflight request), but it turned out not to support cross-origin GETs with `range` (because it doesn't respond to preflight requests at all, afaict).

It seems silly that I could request the _entire_ resource but not a portion of it.

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