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Like, I wrote the code, but I don't understand it. I initially wrote it with all the `make-quote`s being `return`s, and that didn't work, so I experimentally replaced them with make-quotes and it did work. I need to reread the interpreter code to really understand why that was required.

If even the designer can't understand the model here, the model is probably too complicated for anyone ELSE to write self-modifying code either! That's a sign of a problem, or better abstractions needed.