Re: [whatwg/xhr] setRequestHeader behavior doesn't seem to match implementations (#108)

It looks to me like Firefox uses `","` without space for items 2 and 3 of your list (presumably because those pieces were more or less implemented after the current fetch spec was written) and `", "` (with space) for item 1.

What do other UAs do for `Access-Control-Request-Headers`?  Changing behavior here could lead to compat issues, obviously, so if they all agree on `","` we should probably leave it that way (and in particular, depending on what happens with item 1 that might mean that it _can't_ be defined in terms of "combine").

Yes, the inconsistencies are a bit annoying, I agree.

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