Re: [dom] DOMTokenList#toggle: don't treat everything non-undefined as true (#64)

@bzbarsky Thanks for clarifying, I'm not that familiar with Web IDL.

@domenic 
> especially as Edge seems to have purposefully regressed to match Chrome/Safari

Actually, I should've included IE in this matrix as it just doesn't implement the second parameter to the `toggle` method so it obviously ignores `undefined`. So they haven't regressed, they've just implemented a non-compliant behavior.

BTW, I found the Chrome report about that: https://crbug.com/489665. I've reported it to WebKit as well: https://bugs.webkit.org/show_bug.cgi?id=148582.

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