+ ** SXHASH on condition objects no longer returns NIL.
+ ** :ALLOCATION :CLASS slots are better treated; their values are
+ updated on class redefinition, and initforms inherited from
+ superclasses are applied.
+ ** REMOVE-METHOD returns its generic function argument even when
+ no method was removed.
+ ** SHARED-INITIALIZE now initializes the values of the requested
+ slots, including those with :ALLOCATION :CLASS.