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

@mgol Can you report what Safari Tech Preview product for this:

```
<script>
 var el = document.createElement("div");
 el.classList = " a a b ";
 console.log(el.className.length); // 7
 console.log(el.classList.length); // 3
 console.log(el.attributes[0].value); // " a a b "
 console.log(Array.prototype.slice.call(el.classList).join(" ")); // "a a b"
</script>
```

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