Function register

crates/vm/src/stdlib/atexit.rs:9–16

(func: PyObjectRef, args: FuncArgs, vm: &VirtualMachine)

    #[pyfunction]
    fn register(func: PyObjectRef, args: FuncArgs, vm: &VirtualMachine) -> PyObjectRef {
        // Callbacks go in LIFO order (insert at front)
        vm.state
            .atexit_funcs
            .lock()
            .insert(0, Box::new((func.clone(), args)));
        func
    }

    #[pyfunction]
    fn _clear(vm: &VirtualMachine) {