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A while ago, we developed a proposal for real setf functions and a
simple rule for when setf should expand into a call to them. That
proposal was well received by the cleanup committee. Given that
proposal, people can program like this:
(defun foo (x) (gethash x *foo*))
(defun (foo setf) (nv x) (setf (gethash x *foo*) nv))
Which is great.
I think we should get rid of defmethod-setf and defgeneric-setf. I
think they are just superfluous and confusing.