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setf generic functions

A question about the CLOS spec:  are there any restrictions on lambda lists
allowed for setf generic functions?  For example, is the following valid?

	(DEFMETHOD (SETF foo) (new-value (c a-class) :key x y)

        (SETF (foo object) value :x 5)

Neither the CLOS spec nor Keene address this question.  In fact, both documents
need a lot of improvement here; information about setf'ers is sketchy and