* enhancement: SB-EXT:ATOMIC-UPDATE makes it easy to perform non-destructive
updates of CAS-able places (similar to Clojure's swap!).
* bug fix: potential for infinite recursion during compilation of CLOS slot
* enhancement: SB-EXT:ATOMIC-UPDATE makes it easy to perform non-destructive
updates of CAS-able places (similar to Clojure's swap!).
* bug fix: potential for infinite recursion during compilation of CLOS slot