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Re: Ignore and Nil as args

A few days ago I complained about a superflurous warning when NIL
is the name of an arguement.  Now (on cadr-2 20.2) I find the NIL
is ignored.  E.g.
(defun foo (x nil)
       (list x))
compiles to a function of only one argument and complains of too
many arguments when given 2.  Why can't the Lisp Machine treat both
NIL and IGNORE the same in this situation?