** SUBTYPEP is slightly more accurate on heinously complicated
CONS types where some of the members have uncertain (in the
NIL, NIL sense) type relationships to each other.
+ * GENCGC
+ ** Cores produced by SAVE-LISP-AND-DIE on GENCGC platforms are
+ no longer purified unless :PURIFY T is explicitly specified.
+ ** Non-purified cores are significantly smaller than before
changes in sbcl-0.9.5 relative to sbcl-0.9.4:
* new feature: timers based on Zach Beane's excellent timer package