> I tried tracing asksign1/sign1/absarg to get some insight into this problem, but I don't get the "Is 1 zero..." question > in 5.26.0/SBCL. To get the crazy "Is 1 zero ..." question, you'll need to insert a call to $csign into absarg. An unmodified 5.26.0 doesn't have this bug. --Barton