message: Pass &self by ref to Decimal::sqrt
diff: @@ -58,7 +58,7 @@ impl Decimal {
  }
  /// Returns the approximate square root as a Decimal.
  - pub fn sqrt(self) -> Self {
  + pub fn sqrt(&self) -> Self {
  // TODO: Should we have better precision here?
  Decimal(self.0.isqrt() * 1_000_000_000)
  }
  