The "guest" object memory runs in a special virtual machine simulator during the bootstrapping. That simulator uses AST Interpreter to execute the code inside the guest environment before it is installed for real. It uses own special kind of proxies and tricks to do it. The current bootstrap cannot run without class builder in the guest environment, but...

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And how much smaller could the image get if the class builder was removed.

...Guille in his thesis tried different approaches and he was able to produce extremely small images ��(~10 KiB) that did for example only a sum of two numbers.��