make sure that all availables types of the latest bleadperls are
tested

Formerly, if "-allperls" (or nothing) was specified, and there were
5.19.11 and 5.19.11t available, then only one of both was tested. Now
both would be tested.

Note that the current algorithm picks the latest one by type, so if
there's just 5.19.11 and 5.9.0t, then also both would be tested.