You are very right (at least for rc3)
GCL (GNU Common Lisp) Version(2.5.0) Sun Nov 17 15:58:09 CET 2002
Licensed under GNU Library General Public License
Contains Enhancements by W. Schelter
Maxima 5.9.0rc3 http://maxima.sourceforge.net
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
(C1) [a,A,b,B,c,C];
(D1) [a, A, b, B, C, C]
(C2)
Error: Console interrupt.
Fast links are on: do (si::use-fast-links nil) for debugging
Error signalled by MACSYMA-TOP-LEVEL.
Broken at SYSTEM:TERMINAL-INTERRUPT. Type :H for Help.
MAXIMA>>(fboundp '$c)
NIL
MAXIMA>>(symbol-plist '$c)
(SYSTEM:PNAME "$C")
Martin