RULES for Class ops don't fire in HEAD
For the attached programme, compiled with 7.1.20101010, the rule truncate/Double->Int doesn't fire, resulting in
-248407781 1 const 0 took 0.004000s -248407781 truncate took 0.940059s -248407781 double2Int took 0.032002s
i.e. truncate is not rewritten to double2Int, although it is given an explicit type signature (same behaviour without a type signature).
Rule fired: Class op truncate
among (if I haven't miscounted) 41 Class op xxx rules.
IMO it's a show-stopper.