-;;; for TYPE. If speed, space or compilation speed is more important
-;;; than safety, then we return a weaker type if it is easier to
-;;; check. First we try the defined type weakenings, then look for any
-;;; predicate that is cheaper.
+;;; for TYPE. If type checking policy is "fast", then we return a
+;;; weaker type if it is easier to check. First we try the defined
+;;; type weakenings, then look for any predicate that is cheaper.