Re: [whatwg/fetch] Add special handling of `set-cookie` to Headers (PR #1346)

> With the case of the `keys()` iterator here, would the intention of this PR be to make it so that `set-cookie` could appear multiple times? Or should the `keys()` iterator always only produce a unique set? The way this is currently defined, it would appear that the keys iterator could have `set-cookie` multiple times.

That seems intentional in the way pair iteration works in WebIDL. That way, `headers.keys().length === headers.values().length` and the indices match.

Do you think this would break some existing code, though?

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