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For handling function call frames you may consider compiling your Lisp code a bit before interpretation - do an explicit lambda lifting with an explicit closure allocation. This way you'd be free to kill each frame after a call.

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Thanks for this suggestion! I had come across this concept and it's one of the strategies I'm considering trying out to solve that problem.

You can even implement this part of a compilation in your Lisp itself, with a little bit of a bootstrap.

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