diff --git a/Measure-Coverage.ps1 b/Measure-Coverage.ps1
index 12c3312..a214bbb 100644
--- a/Measure-Coverage.ps1
+++ b/Measure-Coverage.ps1
@@ -15,10 +15,10 @@ try {
     Get-ChildItem -Directory src/*.Test*/TestResults/* | Remove-Item -Recurse
 
     # rebuild target project to generate source generator files
-    dotnet build src/QuantitiesDotNet.slnx --no-incremental --property:EmitCompilerGeneratedFiles=true
+    dotnet build QuantitiesDotNet.slnx --no-incremental --property:EmitCompilerGeneratedFiles=true
 
     # test and measure coverage
-    dotnet test src/QuantitiesDotNet.slnx --collect:"XPlat Code Coverage" --settings src/etc/coverlet.runsettings
+    dotnet test QuantitiesDotNet.slnx --collect:"XPlat Code Coverage" --settings src/etc/coverlet.runsettings
 
     # export HTML coverage report
     Get-ChildItem src/*.Test*/TestResults/*/coverage.cobertura.xml `
diff --git a/global.json b/global.json
index c30100d..1e2cd47 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "10.0.101",
+    "version": "10.0.0",
     "rollForward": "latestFeature"
   }
 }
diff --git a/src/QuantitiesDotNet.Generators/QuantityImplementBuilder.cs b/src/QuantitiesDotNet.Generators/QuantityImplementBuilder.cs
index b6e715c..5aa7418 100644
--- a/src/QuantitiesDotNet.Generators/QuantityImplementBuilder.cs
+++ b/src/QuantitiesDotNet.Generators/QuantityImplementBuilder.cs
@@ -308,25 +308,27 @@ private void GenerateSelfOperatorsShape(SourceBuilderSlim sb)
             /// <param name="x"></param>
             /// <param name="y"></param>
             /// <returns></returns>
-            public static bool Equals({{TypeName}} x, {{TypeName}} y)
-                => x._rawValue == y._rawValue;
+            public static bool Equals({{TypeName}} x, {{TypeName}} y) =>
+                x._rawValue == y._rawValue;
 
             /// <summary> Determines which value is greater than another. </summary>
             /// <param name="x"></param>
             /// <param name="y"></param>
             /// <returns></returns>
-            public static int Compare({{TypeName}} x, {{TypeName}} y)
-            {
-                if (x._rawValue == y._rawValue) { return 0; }
-                return x._rawValue < y._rawValue ? -1 : 1;
-            }
-
-            /** <inheritdoc /> */ public static bool operator ==({{TypeName}} x, {{TypeName}} y) => Equals(x, y);
-            /** <inheritdoc /> */ public static bool operator !=({{TypeName}} x, {{TypeName}} y) => !Equals(x, y);
-            /** <inheritdoc /> */ public static bool operator < ({{TypeName}} x, {{TypeName}} y) => Compare(x, y) <  0;
-            /** <inheritdoc /> */ public static bool operator > ({{TypeName}} x, {{TypeName}} y) => Compare(x, y) >  0;
-            /** <inheritdoc /> */ public static bool operator <=({{TypeName}} x, {{TypeName}} y) => Compare(x, y) <= 0;
-            /** <inheritdoc /> */ public static bool operator >=({{TypeName}} x, {{TypeName}} y) => Compare(x, y) >= 0;
+            public static int Compare({{TypeName}} x, {{TypeName}} y) =>
+                (x._rawValue < y._rawValue, x._rawValue > y._rawValue) switch
+                {
+                    (true, false) => -1,
+                    (false, true) => +1,
+                    _ => 0,
+                };
+
+            /** <inheritdoc /> */ public static bool operator ==({{TypeName}} x, {{TypeName}} y) => x._rawValue == y._rawValue;
+            /** <inheritdoc /> */ public static bool operator !=({{TypeName}} x, {{TypeName}} y) => x._rawValue != y._rawValue;
+            /** <inheritdoc /> */ public static bool operator < ({{TypeName}} x, {{TypeName}} y) => x._rawValue <  y._rawValue;
+            /** <inheritdoc /> */ public static bool operator > ({{TypeName}} x, {{TypeName}} y) => x._rawValue >  y._rawValue;
+            /** <inheritdoc /> */ public static bool operator <=({{TypeName}} x, {{TypeName}} y) => x._rawValue <= y._rawValue;
+            /** <inheritdoc /> */ public static bool operator >=({{TypeName}} x, {{TypeName}} y) => x._rawValue >= y._rawValue;
 
             #endregion comparison operator implements
 
diff --git a/src/QuantitiesDotNet.Test/QuantityTest.cs b/src/QuantitiesDotNet.Test/QuantityTest.cs
index 1ade5b1..d5c5cc5 100644
--- a/src/QuantitiesDotNet.Test/QuantityTest.cs
+++ b/src/QuantitiesDotNet.Test/QuantityTest.cs
@@ -60,8 +60,12 @@ public void Compare_NonGeneric<T>(T placeHolder)
         where T : struct, IQuantity<T, double>
     {
         InternalHelpers.NoUse(placeHolder);
-        var _0 = Unsafe.BitCast<double, T>(0.0);
+        var p0 = Unsafe.BitCast<double, T>(+0.0);
+        var n0 = Unsafe.BitCast<double, T>(-0.0);
         var _1 = Unsafe.BitCast<double, T>(1.0);
+        var nan = Unsafe.BitCast<double, T>(double.NaN);
+        var pinf = Unsafe.BitCast<double, T>(double.PositiveInfinity);
+        var ninf = Unsafe.BitCast<double, T>(double.NegativeInfinity);
 
         Assert.Equal(_1, _1);
         Assert.True (_1.Equals(_1));
@@ -75,34 +79,90 @@ public void Compare_NonGeneric<T>(T placeHolder)
         Assert.False(_1 >  _1);
         Assert.True (_1 <= _1);
         Assert.False(_1 <  _1);
+        Assert.Equal(_1.GetHashCode(), _1.GetHashCode());
+
+        Assert.NotEqual(p0, _1);
+        Assert.False(p0.Equals(_1));
+        Assert.False(p0.Equals((object)_1));
+        Assert.False(T.Equals(p0, _1));
+        Assert.True(0 > T.Compare(p0, _1));
+        Assert.True(0 > p0.CompareTo(_1));
+        Assert.False(p0 == _1);
+        Assert.True (p0 != _1);
+        Assert.False(p0 >= _1);
+        Assert.False(p0 >  _1);
+        Assert.True (p0 <= _1);
+        Assert.True (p0 <  _1);
+
+        Assert.NotEqual(_1, p0);
+        Assert.False(_1.Equals(p0));
+        Assert.False(_1.Equals((object)p0));
+        Assert.False(T.Equals(_1, p0));
+        Assert.True(0 < T.Compare(_1, p0));
+        Assert.True(0 < _1.CompareTo(p0));
+        Assert.False(_1 == p0);
+        Assert.True (_1 != p0);
+        Assert.True (_1 >= p0);
+        Assert.True (_1 >  p0);
+        Assert.False(_1 <= p0);
+        Assert.False(_1 <  p0);
+
+        Assert.False(p0.Equals(new object()));
+
+        Assert.Equal(+0.0.GetHashCode(), p0.GetHashCode());
+        Assert.Equal(-0.0.GetHashCode(), n0.GetHashCode());
+        Assert.Equal(1.0.GetHashCode(), _1.GetHashCode());
+        Assert.Equal(double.NaN.GetHashCode(), nan.GetHashCode());
+        Assert.Equal(double.PositiveInfinity.GetHashCode(), pinf.GetHashCode());
+        Assert.Equal(double.NegativeInfinity.GetHashCode(), ninf.GetHashCode());
+
+#pragma warning disable format
+#pragma warning disable CA2242
+        static int compare(double x, double y) =>
+            (x < y, x > y) switch
+            {
+                (true,  false) => -1,
+                (false, true)  => +1,
+                _ =>  0,
+            };
+
+        Assert.Equal(+0.0 == +0.0, p0 == p0);
+        Assert.Equal(+0.0 <  +0.0, p0 <  p0);
+        Assert.Equal(+0.0 >  +0.0, p0 >  p0);
+        Assert.Equal(+0.0 <= +0.0, p0 <= p0);
+        Assert.Equal(+0.0 >= +0.0, p0 >= p0);
+        Assert.Equal(compare(+0.0, +0.0), T.Compare(p0, p0));
+
+        Assert.Equal(+0.0 == -0.0, p0 == n0);
+        Assert.Equal(+0.0 <  -0.0, p0 <  n0);
+        Assert.Equal(+0.0 >  -0.0, p0 >  n0);
+        Assert.Equal(+0.0 <= -0.0, p0 <= n0);
+        Assert.Equal(+0.0 >= -0.0, p0 >= n0);
+        Assert.Equal(compare(+0.0, -0.0), T.Compare(p0, n0));
+
+        Assert.Equal(double.NaN == double.NaN, nan == nan);
+        Assert.Equal(double.NaN <  double.NaN, nan <  nan);
+        Assert.Equal(double.NaN >  double.NaN, nan >  nan);
+        Assert.Equal(double.NaN <= double.NaN, nan <= nan);
+        Assert.Equal(double.NaN >= double.NaN, nan >= nan);
+        Assert.Equal(compare(double.NaN, double.NaN), T.Compare(nan, nan));
+
+        Assert.Equal(double.PositiveInfinity == double.PositiveInfinity, pinf == pinf);
+        Assert.Equal(double.PositiveInfinity <  double.PositiveInfinity, pinf <  pinf);
+        Assert.Equal(double.PositiveInfinity >  double.PositiveInfinity, pinf >  pinf);
+        Assert.Equal(double.PositiveInfinity <= double.PositiveInfinity, pinf <= pinf);
+        Assert.Equal(double.PositiveInfinity >= double.PositiveInfinity, pinf >= pinf);
+        Assert.Equal(compare(double.PositiveInfinity, double.PositiveInfinity), T.Compare(pinf, pinf));
+
+        Assert.Equal(double.NegativeInfinity == double.NegativeInfinity, ninf == ninf);
+        Assert.Equal(double.NegativeInfinity <  double.NegativeInfinity, ninf <  ninf);
+        Assert.Equal(double.NegativeInfinity >  double.NegativeInfinity, ninf >  ninf);
+        Assert.Equal(double.NegativeInfinity <= double.NegativeInfinity, ninf <= ninf);
+        Assert.Equal(double.NegativeInfinity >= double.NegativeInfinity, ninf >= ninf);
+        Assert.Equal(compare(double.NegativeInfinity, double.NegativeInfinity), T.Compare(ninf, ninf));
+#pragma warning restore CA2242
+#pragma warning restore format
 
-        Assert.NotEqual(_0, _1);
-        Assert.False(_0.Equals(_1));
-        Assert.False(_0.Equals((object)_1));
-        Assert.False(T.Equals(_0, _1));
-        Assert.True(0 > T.Compare(_0, _1));
-        Assert.True(0 > _0.CompareTo(_1));
-        Assert.False(_0 == _1);
-        Assert.True (_0 != _1);
-        Assert.False(_0 >= _1);
-        Assert.False(_0 >  _1);
-        Assert.True (_0 <= _1);
-        Assert.True (_0 <  _1);
-
-        Assert.NotEqual(_1, _0);
-        Assert.False(_1.Equals(_0));
-        Assert.False(_1.Equals((object)_0));
-        Assert.False(T.Equals(_1, _0));
-        Assert.True(0 < T.Compare(_1, _0));
-        Assert.True(0 < _1.CompareTo(_0));
-        Assert.False(_1 == _0);
-        Assert.True (_1 != _0);
-        Assert.True (_1 >= _0);
-        Assert.True (_1 >  _0);
-        Assert.False(_1 <= _0);
-        Assert.False(_1 <  _0);
-
-        Assert.False(_0.Equals(new object()));
     }
 
     [Theory]
@@ -111,7 +171,8 @@ public void Compare_Generic<T>(T placeHolder)
         where T : struct, IQuantity<T, decimal>
     {
         InternalHelpers.NoUse(placeHolder);
-        var _0 = Unsafe.BitCast<decimal, T>(0.0m);
+        var p0 = Unsafe.BitCast<decimal, T>(+0.0m);
+        var n0 = Unsafe.BitCast<decimal, T>(-0.0m);
         var _1 = Unsafe.BitCast<decimal, T>(1.0m);
 
         Assert.Equal(_1, _1);
@@ -126,34 +187,65 @@ public void Compare_Generic<T>(T placeHolder)
         Assert.False(_1 >  _1);
         Assert.True (_1 <= _1);
         Assert.False(_1 <  _1);
-
-        Assert.NotEqual(_0, _1);
-        Assert.False(_0.Equals(_1));
-        Assert.False(_0.Equals((object)_1));
-        Assert.False(T.Equals(_0, _1));
-        Assert.True(0 > T.Compare(_0, _1));
-        Assert.True(0 > _0.CompareTo(_1));
-        Assert.False(_0 == _1);
-        Assert.True (_0 != _1);
-        Assert.False(_0 >= _1);
-        Assert.False(_0 >  _1);
-        Assert.True (_0 <= _1);
-        Assert.True (_0 <  _1);
-
-        Assert.NotEqual(_1, _0);
-        Assert.False(_1.Equals(_0));
-        Assert.False(_1.Equals((object)_0));
-        Assert.False(T.Equals(_1, _0));
-        Assert.True(0 < T.Compare(_1, _0));
-        Assert.True(0 < _1.CompareTo(_0));
-        Assert.False(_1 == _0);
-        Assert.True (_1 != _0);
-        Assert.True (_1 >= _0);
-        Assert.True (_1 >  _0);
-        Assert.False(_1 <= _0);
-        Assert.False(_1 <  _0);
-
-        Assert.False(_0.Equals(new object()));
+        Assert.Equal(_1.GetHashCode(), _1.GetHashCode());
+
+        Assert.NotEqual(p0, _1);
+        Assert.False(p0.Equals(_1));
+        Assert.False(p0.Equals((object)_1));
+        Assert.False(T.Equals(p0, _1));
+        Assert.True(0 > T.Compare(p0, _1));
+        Assert.True(0 > p0.CompareTo(_1));
+        Assert.False(p0 == _1);
+        Assert.True (p0 != _1);
+        Assert.False(p0 >= _1);
+        Assert.False(p0 >  _1);
+        Assert.True (p0 <= _1);
+        Assert.True (p0 <  _1);
+
+        Assert.NotEqual(_1, p0);
+        Assert.False(_1.Equals(p0));
+        Assert.False(_1.Equals((object)p0));
+        Assert.False(T.Equals(_1, p0));
+        Assert.True(0 < T.Compare(_1, p0));
+        Assert.True(0 < _1.CompareTo(p0));
+        Assert.False(_1 == p0);
+        Assert.True (_1 != p0);
+        Assert.True (_1 >= p0);
+        Assert.True (_1 >  p0);
+        Assert.False(_1 <= p0);
+        Assert.False(_1 <  p0);
+
+        Assert.False(p0.Equals(new object()));
+
+        Assert.Equal(+0.0m.GetHashCode(), p0.GetHashCode());
+        Assert.Equal(-0.0m.GetHashCode(), n0.GetHashCode());
+        Assert.Equal(1.0m.GetHashCode(), _1.GetHashCode());
+
+#pragma warning disable format
+#pragma warning disable CA2242
+        static int compare(double x, double y) =>
+            (x < y, x > y) switch
+            {
+                (true,  false) => -1,
+                (false, true)  => +1,
+                _ =>  0,
+            };
+
+        Assert.Equal(+0.0 == +0.0, p0 == p0);
+        Assert.Equal(+0.0 <  +0.0, p0 <  p0);
+        Assert.Equal(+0.0 >  +0.0, p0 >  p0);
+        Assert.Equal(+0.0 <= +0.0, p0 <= p0);
+        Assert.Equal(+0.0 >= +0.0, p0 >= p0);
+        Assert.Equal(compare(+0.0, +0.0), T.Compare(p0, p0));
+
+        Assert.Equal(+0.0 == -0.0, p0 == n0);
+        Assert.Equal(+0.0 <  -0.0, p0 <  n0);
+        Assert.Equal(+0.0 >  -0.0, p0 >  n0);
+        Assert.Equal(+0.0 <= -0.0, p0 <= n0);
+        Assert.Equal(+0.0 >= -0.0, p0 >= n0);
+        Assert.Equal(compare(+0.0, -0.0), T.Compare(p0, n0));
+#pragma warning restore CA2242
+#pragma warning restore format
     }
 
 #pragma warning restore CS1718
diff --git a/src/QuantitiesDotNet/IQuantity.cs b/src/QuantitiesDotNet/IQuantity.cs
index 0418cde..87ef13a 100644
--- a/src/QuantitiesDotNet/IQuantity.cs
+++ b/src/QuantitiesDotNet/IQuantity.cs
@@ -39,13 +39,36 @@ public interface IQuantity<TSelf, T>
     /// <param name="x"></param>
     /// <param name="y"></param>
     /// <returns></returns>
+    /// <remarks>
+    /// The implementation must be <c>x.RawValue == y.RawValue</c>.
+    /// The behaviour for edge cases conforms to the implementation of <typeparamref name="T"/>.
+    /// </remarks>
     public static abstract bool Equals(TSelf x, TSelf y);
 
     /// <summary> Determines which value is greater than another. </summary>
     /// <param name="x"></param>
     /// <param name="y"></param>
     /// <returns></returns>
+    /// <remarks>
+    /// The implementation must be <c>x.RawValue == y.RawValue ? 0 : (x.RawValue &lt; y.RawValue ? -1 : 1)</c>.
+    /// The behaviour for edge cases conforms to the implementation of <typeparamref name="T"/>.
+    /// </remarks>
     public static abstract int Compare(TSelf x, TSelf y);
 
+    /// <inheritdoc cref="object.GetHashCode"/>
+    /// <remarks>
+    /// The implementation must be:
+    /// <code>
+    /// (x.RawValue &lt; y.RawValue, x.RawValue &gt; y.RawValue) switch
+    /// {
+    ///     (true, false) => -1,
+    ///     (false, true) => +1,
+    ///     _ => 0,
+    /// }
+    /// </code>
+    /// The behaviour for edge cases conforms to the implementation of <typeparamref name="T"/>.
+    /// </remarks>
+    public int GetHashCode();
+
 #endif
 }