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question @ COPY-SEQ

    Date: 30 May 89 10:52
    From: chapman%aitg.DEC@decwrl.dec.com

    Does anyone have a problem if I change the predicate in the description
    from EQUALP to EQL?

Yes, that would be completely wrong!  What CLtL says is correct.
It's true that one could invent a stronger predicate than EQUALP
which COPY-SEQ would be an identity under, in particular, one that
was case-sensitive for character and string comparison.  However,
among the existing Common Lisp predicates, EQUALP is the only one
under which COPY-SEQ is an identity function.