This may be a stupid question, but… Why does the arrow on DataTable sorting seem backward?

If you look at the example:
http://quasar-framework.org/quasar-play/android/index.html#/showcase/grouping/data-table

and sort by Time Range, there’s a down arrow when it’s sorted ascending, and an up arrow when it’s sorted descending. This seems backwards from standard convention, does it not?

(See also here.)