+ ;; In older SBCL's the type-check-function is computed at
+ ;; defclass expansion, which is too early for the CLSQL type
+ ;; conversion to take place. This gets rid of it. It's ugly
+ ;; but it's better than nothing -wcp10/4/10.
+ #+(and sbcl #.(cl:if (cl:find-symbol "%TYPE-CHECK-FUNCTION" :sb-pcl) '(and) '(or)))
+ (setf (slot-value esd 'sb-pcl::%type-check-function) nil)