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utilize classList when supported (refs #5087) #1190
That comment wasn't there when I visited the ticket just before closing the PR... I've owned the ticket and babysit the implementation schedule for years and I stand by these decisions:
Well, multiple classes don't seem to be a performance issue anymore, at least it didn't seem so in my test cases on jsFiddle, even with the current limited classList API.
But I understand that as the className path is required even for jQuery 2.0 because of IE9, your first two points have settled it by themselves so I respect your decision.