Function hex

crates/vm/src/stdlib/builtins.rs:674–678

(number: ArgIndex)

    #[pyfunction]
    fn hex(number: ArgIndex) -> String {
        let number = number.into_int_ref();
        let n = number.as_bigint();
        format!("{n:#x}")
    }

    #[pyfunction]
    fn id(obj: PyObjectRef) -> usize {