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

@AmeliaBR  `Intl` could be used to normalize date and time values at HTML element attribute or text content.

The index of an element within a collection of N possibly infinite sets of values is sufficient to get that specific set within the total possible lexicographic arrangements of individual values within a set of a collection. 

If the elements of any set are unique the values themselves can be ignored. 

The question, from perspective here, would be is it more expensive to create a map of the total dataset with corresponding logical key to get an index of a pre-sorted and stored set which retrieves that unique value, or to sort the dataset dynamically at each call to the sort function without storing the accrued results of the sort function calls, to prevent for example, having to iterate to 51 out of 100 or 49 in reverse to get a single sort order that will not change from the initial call to the compare function to the next call to the compare function.


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