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Re: Issue: ALIST-NIL (Version 1)

You didn't mention that the [R]ASSOC[-IF[-NOT]] functions might be
faster if they didn't have to check for NIL.

In general, I'm in favor of this, but I'm somewhat concerned about
compatibility.  However, I think "Cost to User #1" isn't really much
of an argument.  #2 is an issue, though, and your suggestion isn't
good enough a work-around, since it might change the behavior for the
xxx-IF and xxx-IF-NOT functions, depending on the predicate used.