*sort(*desc) isn't working right

(Bug, Closed -> Fixed, Priority: High, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Summary: Illustrated by the Issues by Modification Time View here -- the _desc modifier seems to have gotten broken somehow...
Problem was a fairly subtle bug I introduced into _sort a few weeks back, that broke _desc. There is now a unit test for _desc, so hopefully it won't happen again.