Re: [whatwg/dom] Future for unique tokens in DOMTokenList (#201)

@ArkadiuszMichalski 
```js
var el = document.createElement("div");
el.classList = " a a b ";
console.log(el.className.length); // 3
console.log(el.classList.length); // 2
console.log(el.attributes[0].value); // "a b "
console.log(Array.prototype.slice.call(el.classList).join(" ")); // "a b"
```

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