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A simple question

What is the version number of your Sun Common Lisp ?  try calling
(lisp-implementation-version), or look at the initial greeting.

Version 2 (and it's follow-ons) has been current since December 1986,
and doesn't have the pessimization you reported, namely that
(not (not x)) ==> x.   Version 1 appears to have the problem.

As has often been remarked, "The source of all bugs is pre-mature

-- JonL --