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Answer: Why are fixnums in Emacs only 29 bits? a use case for common lisp

Emacs-Lisp is a dynamically-typed language. This means that you need type tags at runtime. If you wanted to work with numbers, you would therefore normally have to pack them into some kind of tagged container that you can point to (i.e. “box” them), as there is no way of distinguishing…

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