Re: [whatwg/dom] Add convenient, ergonomic, performant API for sorting siblings (#586)

> And there is also the [replaceChildren](https://developer.mozilla.org/en-US/docs/Web/API/Element/replaceChildren) API...

As that name suggests, `replaceChildren` does, in fact, **replace** children, it doesn't re-order children.

With this argument, we don't need any sorting API neither:

```js
parent.replaceChildren(
  [...parent.children].sort(
   (a, b) => (
        parseFloat(a.dataset.order) -
        parseFloat(b.dataset.order)
    )
  )
);
```

If the sorting is smarter at *not* removing children that don't need to be moved (less mutations on the tree) then it is a missed opportunity to confine that ability to same list length and same nodes only and via attributes, that is why I've raised my suggestion we could do a little more and solve diffing forever on the DOM.

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