** :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.
planned incompatible changes in 0.8.x:
* (not done yet, but planned:) When the profiling interface settles