;;; otherwise dealing with STANDARD-INSTANCE-ACCESS becomes harder
;;; -- and slower -- than it needs to be.
(defconstant +slot-unbound+ '..slot-unbound..
- "SBCL specific extentions to MOP: if this value is read from an
+ "SBCL specific extensions to MOP: if this value is read from an
instance using STANDARD-INSTANCE-ACCESS, the slot is unbound.
Similarly, an :INSTANCE allocated slot can be made unbound by
assigning this to it using (SETF STANDARD-INSTANCE-ACCESS).