** FIND-METHOD signals an error if the lengths of the specializers
is incompatible with the generic function, even if the ERRORP
argument is true.
+ ** TYPE-OF returns recognizeable subtypes of all built-in-types of
+ which its argument is a member.
+ ** DEFCLASS only redefines the class named by its class-name
+ argument if that name is the proper name of the class;
+ otherwise, it creates a new class.
planned incompatible changes in 0.8.x:
* (not done yet, but planned:) When the profiling interface settles