sort: compatibility of human-numeric sort

Closes #1985. This makes human-numeric sort follow the same algorithm as GNU's/FreeBSD's sort. As documented by GNU in https://www.gnu.org/software/coreutils/manual/html_node/sort-invocation.html, we first compare by sign, then by si unit and finally by the numeric value.
2026-06-10 15:48:22 -07:00 · 2021-06-25 18:19:00 +02:00
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