The Lisp variant that the compiler supports at the moment only handles f64 numbers so I don't think this kind of issue is possible. However, this is a very rel

The Lisp variant that the compiler supports at the moment only handles f64 numbers so I don't think this kind of issue is possible. However, this is a very relevant point. If the goal is just shorter code (as opposed to a mix of shorter code and less run-time operations), then you need to check that folding strings (and similar types) actually makes the expression shorter to represent.