with Allegro CL in "modern" mode. Although we don't think that
"modern" mode is the correct approach to case-sensitivity in CL, the
changes we made should also make it easier to work in ANSI-compliant
implementations/modes, with all the settings for readtable-case. Note
though that this is a first best effort attempt, and so further
case-ification bugs might still remain. YMMV.