fix: format ZERO as 0.0 not -0.0

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to `const-decimal`.
 
 ## Unreleased
 
+## 0.2.2
+
+- Correctly format `Decimal::ZERO` as `0.0...` not `-0.0...`.
+
 ## 0.2.1
 
 - Added `Decimal::to_f64(&self)`.

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "const-decimal"
 description = "Integer-backed decimals with constant precision"
-version = "0.2.1"
+version = "0.2.2"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 authors = ["Oliver Chalk"]
@@ -23,9 +23,11 @@ module_name_repetitions = "allow"
 [features]
 serde = ["dep:serde"]
 borsh = ["dep:borsh"]
+malachite = ["dep:malachite"]
 
 [dependencies]
 borsh = { version = "1.5.1", features = ["derive"], optional = true }
+malachite = { version = "0.4.16", optional = true }
 num-traits = "0.2.19"
 paste = "1.0.15"
 ruint = "1.12.3"

src/display.rs

@@ -12,7 +12,7 @@ where
     I: ScaledInteger<D>,
 {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let (sign, unsigned) = match self.0 < I::ONE {
+        let (sign, unsigned) = match self.0 < I::ZERO {
             // NB: Integers do not implement negation, so lets use two's complement to flip the sign
             // of the signed integer (modelled as an unsigned integer).
             true => ("-", (!self.0).wrapping_add(&I::ONE)),
@@ -150,6 +150,7 @@ mod tests {
 
     #[test]
     fn int64_9_to_string() {
+        assert_eq!(Int64_9::ZERO.to_string(), "0.000000000");
         assert_eq!(Int64_9::ONE.to_string(), "1.000000000");
         assert_eq!(Int64_9::from_scaled(123, 9).to_string(), "0.000000123");
         assert_eq!((Int64_9::ONE + Int64_9::from_scaled(123, 9)).to_string(), "1.000000123");

src/foreign_traits/mod.rs

@@ -1,6 +1,6 @@
 #[cfg(feature = "borsh")]
 mod borsh;
-#[cfg(test)]
+#[cfg(any(test, feature = "malachite"))]
 mod malachite;
 #[cfg(test)]
 mod proptest;