Hi Igor, I was interested by your suggestion in this message:

  http://lists.gforge.inria.fr/pipermail/pharo-project/2010-February/022526.html

I thought it sounded neat because it would seem to bring "dynamic
state" to objects.  Objects wouldn't have to rely on instVars defined
in classes to extend state, all while providing logical solutions to
some of the issues like immutability and 12-bit identity-hashes..  Is
it a good idea?