Andreas,

Way back in 2002 (2.7 days) I implemented Rivest
et.al's Compatibility model for Squeak.
 
See
http://squeak.cs.uiuc.edu/mail/squeak/msg00728.html
for how to do it.
 
NB. Read Rivest's paper on explicit metaclasses:
http://minnow.cc.gatech.edu/squeak/400

Alas the site hosting the changes is no more, but
the mail above lays it all out.
 
The implementation is quite simple - the hard parts
is getting to grips with the circularity.
 
Changing the file/in file out and browser would be
 the other (tedious) task.
 
Cheers

Brent
2

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