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Re: CAR of NIL

True enough.  Standard Lisp defines () as NIL, but its CAR and CDR are
illegal.  I don't see the conversion to () as a great effort, mainly just
a matter of finding cases of 'NIL.  Since I don't have an ideological axe to
grind, I see the issue as the cost of converting old code vs. the cost to
new implementations of overloading NIL.