As I have a huge collection of old stuff, here I attach which clases was in 3.2 and was ripped or changed later In the past my idea is to have some on web like we made for 3.10
http://ftp.squeak.org/Experiments/3dot8/ http://ftp.squeak.org/Experiments/3dot9/ http://ftp.squeak.org/Experiments/3dot10/
Later I extent this in my http://squeakros.org/4dot4 http://squeakros.org/4dot5 The idea is with a recursive dnu mechanisms you go back from XdotY until you found the class.
This is a really interesting idea.
Backward compatibility is a hard problem to solve, but it is a really interesting challenge. I love being able to explore old Squeak images and projects, it is like having a reference library for ideas and experiments.
+1
Stef