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

There's two reasons people use `order`: one's convenience, and the other is speed. We'd need to address both, though not necessarily in a single API.

Having a sorting method that takes a comparator function which accepts two elements would be convenient, and might be worth having, but it alone wouldn't solve the problem here. As @domenic says, we need something that doesn't call back into JS for the simple cases, and as @annevk says, it should be an atomic operation from the DOM's perspective. Otherwise we give up most of the optimization opportunities that would allow for comparative performance.

Sorting by passing in an attribute name would get you parity with Roma's CSS-based solution, both in simplicity and (insofar as possible) performance. If it's not too hard, I'd suggest accepting numberish things rather than just numbers, so that you can get dates and dimensions and currency sorts (on normalized values) for free. Folks wanting string sorting or other fancy operations client-side would need to either generate numeric keys, or use a method that takes a comparator-function. (They can't use `order` without some kind of key preprocessing anyway, so that's no different.) Such an API is likely worth having as well, though--its convenience and power, rather than performance and simplicity, would be the draw.

@bradkemper That's off-topic.

Whatever we end up with here, please file an issue back against Flexbox to add some good examples, to steer people towards it once it's available. :)

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