where
    D: Deserializer<'de>,
  {
    Ok(DeserializeFromStr::deserialize(deserializer)?.0)
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn rarity() {
    assert_eq!(Sat(0).rarity(), Rarity::Mythic);
    assert_eq!(Sat(1).rarity(), Rarity::Common);

    assert_eq!(Sat(50 * COIN_VALUE - 1).rarity(), Rarity::Common);
    assert_eq!(Sat(50 * COIN_VALUE).rarity(), Rarity::Uncommon);
    assert_eq!(Sat(50 * COIN_VALUE + 1).rarity(), Rarity::Common);

    assert_eq!(
      Sat(50 * COIN_VALUE * u64::from(DIFFCHANGE_INTERVAL) - 1).rarity(),
      Rarity::Common
    );
    assert_eq!(
      Sat(50 * COIN_VALUE * u64::from(DIFFCHANGE_INTERVAL)).rarity(),
      Rarity::Rare
    );
    assert_eq!(
      Sat(50 * COIN_VALUE * u64::from(DIFFCHANGE_INTERVAL) + 1).rarity(),
      Rarity::Common
    );

    assert_eq!(
      Sat(50 * COIN_VALUE * u64::from(SUBSIDY_HALVING_INTERVAL) - 1).rarity(),
      Rarity::Common
    );
    assert_eq!(
      Sat(50 * COIN_VALUE * u64::from(SUBSIDY_HALVING_INTERVAL)).rarity(),