>> But even here I would rather just take a function instead of requiring
>> it to be the instance of some interface:
>>
>> function sort($input, callable $comparator($a, $b): int) {
>> /* … */
>> }
>
> Fair, but the sorting case isn't the only one that matters,
> particularly with <=> now as part of the language.
For completeness: I advocate accepting a comparator in every case
where custom comparison logic is needed, not just for sorting.
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