-;;; KLUDGE: Various of these (e.g. AREF and BIT) have DEFUN (SETF FOO) versions
-;;; too. Do we really need both? -- WHN 19990921
+;;; (setf aref/bit/sbit) are implemented using setf-functions,
+;;; because they have to work with (setf (apply #'aref array subscripts))
+;;; All other setfs can be done using setf-functions too, but I
+;;; haven't found technical advantages or disatvantages for either
+;;; scheme.