rany : decode/encode usize to radix any

#[test]
fn test() {
  use rany::{Rany, URL_ID};
  let num = 1234567890;
  let rany = Rany(URL_ID);
  let r = rany.e(num);
  dbg!(&r);
  let r = rany.d(r);
  dbg!(r);
}