Re: [whatwg/dom] Spec for DOMTokenList stringifier disagrees with every single implementation (#105)

@ArkadiuszMichalski: There has been no issue reported since we've made the change in WebKit (granted, the change has not shipped in Safari yet but it does not some testing still).

IMHO, having duplicates or extra spaces is a corner case which is why I was not too worried about backward compatibility when I made the change in WebKit.

As I said before, if it turns out to be breaking sites, I will revert the change but there has been no issue so far and I do think it is worth trying to ship this change.

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