rany : decode/encode usize to radix any

#[test]
fn test() {
  use rany::RANY_URL_ID as rany;
  for num in [1234567890, 0, 1] {
    let r = rany.e(num);
    dbg!(&r);
    let r = rany.d(r);
    dbg!(r);
  }
}