trait Hash {
  fun hash() -> Int;
  // fun hashTo(hasher: Hasher);
}

impl Hash for Bool {
  fun hash() -> Int = self.hash();
}

impl Hash for Byte {
  fun hash() -> Int = self.hash();
}

impl Hash for Int {
  fun hash() -> Int = self.hash();
}

impl Hash for Long {
  fun hash() -> Int = self.hash();
}

impl Hash for Float {
  fun hash() -> Int = self.hash();
}

impl Hash for Double {
  fun hash() -> Int = self.hash();
}