Feature/identification

Source/Directory.Build.targets

@@ -23,6 +23,10 @@
     </PackageReference>
   </ItemGroup>
 
+  <PropertyGroup Condition="$(TargetFramework.StartsWith('net4')) OR $(TargetFramework.StartsWith('netstandard')) OR $(TargetFramework.StartsWith('net6'))">
+    <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+  </PropertyGroup>
+
   <PropertyGroup Condition="$(AssemblyName.EndsWith('Tests'))">
     <IsTestProject>true</IsTestProject>
     <IsPackable>false</IsPackable>

Source/Directory.Packages.props

@@ -3,32 +3,32 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="AwesomeAssertions" Version="9.3.0" />
+    <PackageVersion Include="AwesomeAssertions" Version="9.4.0" />
     <PackageVersion Include="BenchmarkDotNet" Version="0.15.3" />
-    <PackageVersion Include="coverlet.collector" Version="6.0.4" />
+    <PackageVersion Include="coverlet.collector" Version="8.0.1" />
     <PackageVersion Include="Disposal.Interfaces" Version="1.0.3" />
     <PackageVersion Include="Initialization.Interfaces" Version="1.0.3" />
-    <PackageVersion Include="JustMock" Version="2025.4.1112.487" />
+    <PackageVersion Include="JustMock" Version="2026.1.211.494" />
     <PackageVersion Include="MemoryPack" Version="1.21.4" />
-    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.2" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.102" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.102" />
+    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.5" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.201" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.201" />
     <PackageVersion Include="Microsoft.VisualStudio.Threading" Version="17.14.15" />
     <PackageVersion Include="Microsoft.VisualStudio.Threading.Only" Version="17.14.15" />
     <PackageVersion Include="Paket.Core" Version="9.0.2" />
     <PackageVersion Include="PolySharp" Version="1.15.0" />
     <PackageVersion Include="StyleCop.Analyzers.Unstable" Version="1.2.0.556" />
-    <PackageVersion Include="Sundew.DiscriminatedUnions" Version="5.4.1" />
+    <PackageVersion Include="Sundew.DiscriminatedUnions" Version="6.0.1" />
     <PackageVersion Include="Sundew.Packaging.Publish" Version="10.0.12" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="System.Reflection.Metadata" Version="9.0.4" />
-    <PackageVersion Include="System.Security.Permissions" Version="10.0.2" />
+    <PackageVersion Include="System.Security.Permissions" Version="10.0.5" />
     <PackageVersion Include="TransparentMoq" Version="4.20.70.2" />
-    <PackageVersion Include="TUnit" Version="1.12.111" />
+    <PackageVersion Include="TUnit" Version="1.24.31" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
-    <PackageVersion Include="System.Collections.Immutable" Version="10.0.2" />
+    <PackageVersion Include="System.Collections.Immutable" Version="10.0.5" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
     <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />

Source/Sundew.Base.Collections.Immutable/ValueArray{TItem}.cs

@@ -160,12 +160,12 @@ IEnumerator<TItem> IEnumerable<TItem>.GetEnumerator()
     /// <returns>The hashcode.</returns>
     public override int GetHashCode()
     {
-        if (this.inner.HasValue)
+        if (this.Count == 0)
         {
-            return StructuralComparisons.StructuralEqualityComparer.GetHashCode(this.inner);
+            return 0;
         }
 
-        return 0;
+        return StructuralComparisons.StructuralEqualityComparer.GetHashCode(this.inner!);
     }
 
     /// <summary>
@@ -175,6 +175,11 @@ public override int GetHashCode()
     /// <returns><c>true</c>, if the values are equal otherwise false.</returns>
     public bool Equals(ValueArray<TItem> other)
     {
+        if (this.Count == 0 && other.Count == 0)
+        {
+            return true;
+        }
+
         return StructuralComparisons.StructuralEqualityComparer.Equals(this.inner, other.inner);
     }
 

Source/Sundew.Base.Collections.Immutable/ValueDictionary{TKey,TValue}.cs

@@ -162,13 +162,13 @@ public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
     public override int GetHashCode()
     {
 #if NETSTANDARD2_0_OR_GREATER || NET6_0_OR_GREATER
-        if (this.inner == null)
+        if (this.Count == 0)
         {
             return 0;
         }
 
         var hashCode = default(HashCode);
-        foreach (var pair in this.inner)
+        foreach (var pair in this.inner!)
         {
             hashCode.Add(pair.Key);
             hashCode.Add(pair.Value);
@@ -186,7 +186,7 @@ static int CombineHashCode(int hashCode1, int hashcode2)
             }
         }
 
-        return this.inner == default ? 0 : Equality.Equality.GetItemsHashCode(this.inner.Select(x => CombineHashCode(x.Key?.GetHashCode() ?? 0, x.Value?.GetHashCode() ?? 0)));
+        return this.Count == 0 ? 0 : Equality.Equality.GetItemsHashCode(this.inner!.Select(x => CombineHashCode(x.Key?.GetHashCode() ?? 0, x.Value?.GetHashCode() ?? 0)));
 
 #endif
     }
@@ -198,6 +198,11 @@ static int CombineHashCode(int hashCode1, int hashcode2)
     /// <returns><c>true</c>, if the values are equal otherwise false.</returns>
     public bool Equals(ValueDictionary<TKey, TValue> other)
     {
+        if (this.Count == 0 && other.Count == 0)
+        {
+            return true;
+        }
+
         if (this.inner == null)
         {
             if (other.inner == null)

Source/Sundew.Base.Collections.Immutable/ValueList{TItem}.cs

@@ -133,20 +133,20 @@ public IEnumerator<TItem> GetEnumerator()
     public override int GetHashCode()
     {
 #if NETSTANDARD2_0_OR_GREATER || NET6_0_OR_GREATER
-        if (this.inner == null)
+        if (this.Count == 0)
         {
             return 0;
         }
 
         var hashCode = default(HashCode);
-        foreach (var item in this.inner)
+        foreach (var item in this.inner!)
         {
             hashCode.Add(item?.GetHashCode() ?? 0);
         }
 
         return hashCode.ToHashCode();
 #else
-        return this.inner == default ? 0 : Equality.Equality.GetItemsHashCode(this.inner.Select(x => x?.GetHashCode() ?? 0));
+        return this.Count == 0 ? 0 : Equality.Equality.GetItemsHashCode(this.inner!.Select(x => x?.GetHashCode() ?? 0));
 
 #endif
     }
@@ -158,6 +158,11 @@ public override int GetHashCode()
     /// <returns><c>true</c>, if the values are equal otherwise false.</returns>
     public bool Equals(ValueList<TItem> other)
     {
+        if (this.Count == 0 && other.Count == 0)
+        {
+            return true;
+        }
+
         if (this.inner == null)
         {
             if (other.inner == null)

Source/Sundew.Base.Collections.Linq/Empty.cs

@@ -14,9 +14,9 @@ namespace Sundew.Base.Collections.Linq;
 /// </summary>
 /// <typeparam name="TItem">The item type.</typeparam>
 #if NETSTANDARD2_0_OR_GREATER || NET6_0_OR_GREATER
-public sealed record Empty<TItem> : ListCardinality<TItem>
+public sealed partial record Empty<TItem> : ListCardinality<TItem>
 #else
-public sealed class Empty<TItem> : ListCardinality<TItem>
+public sealed partial class Empty<TItem> : ListCardinality<TItem>
 #endif
 {
 }

Source/Sundew.Base.Collections.Linq/Item.cs

@@ -14,6 +14,18 @@ namespace Sundew.Base.Collections.Linq;
 /// </summary>
 public static class Item
 {
+    /// <summary>
+    /// Converts the item into an item result.
+    /// </summary>
+    /// <typeparam name="TSuccess">The success type.</typeparam>
+    /// <param name="result">The result.</param>
+    /// <returns>An Item result.</returns>
+    [MethodImpl((MethodImplOptions)0x300)]
+    public static Item<TSuccess> PassIfSuccess<TSuccess>(R<TSuccess> result)
+    {
+        return result.ToItem();
+    }
+
     /// <summary>
     /// Converts the item into an item result.
     /// </summary>
@@ -167,6 +179,18 @@ public static Item<TValue> ToItem<TValue>(this TValue? option)
         return new Item<TValue>(option, option.HasValue);
     }
 
+    /// <summary>
+    /// Converts the option to an item.
+    /// </summary>
+    /// <typeparam name="TResult">The value type.</typeparam>
+    /// <param name="result">The result.</param>
+    /// <returns>The new item.</returns>
+    [MethodImpl((MethodImplOptions)0x300)]
+    public static Item<TResult> ToItem<TResult>(this R<TResult> result)
+    {
+        return new Item<TResult>(result.Value, result.IsSuccess);
+    }
+
     /// <summary>
     /// Converts the option to an item.
     /// </summary>

Source/Sundew.Base.Collections.Linq/Multiple.cs

@@ -15,9 +15,9 @@ namespace Sundew.Base.Collections.Linq;
 /// </summary>
 /// <typeparam name="TItem">The item type.</typeparam>
 #if NETSTANDARD2_0_OR_GREATER || NET6_0_OR_GREATER
-public sealed record Multiple<TItem> : ListCardinality<TItem>, IEnumerable<TItem>
+public sealed partial record Multiple<TItem> : ListCardinality<TItem>, IEnumerable<TItem>
 #else
-public sealed class Multiple<TItem> : ListCardinality<TItem>, IEnumerable<TItem>
+public sealed partial class Multiple<TItem> : ListCardinality<TItem>, IEnumerable<TItem>
 #endif
 {
     /// <summary>

Source/Sundew.Base.Collections.Linq/Single.cs

@@ -12,7 +12,7 @@ namespace Sundew.Base.Collections.Linq;
 /// </summary>
 /// <typeparam name="TItem">The item type.</typeparam>
 #if NETSTANDARD2_0_OR_GREATER || NET6_0_OR_GREATER
-public sealed record Single<TItem> : ListCardinality<TItem>
+public sealed partial record Single<TItem> : ListCardinality<TItem>
 #else
 public sealed class Single<TItem> : ListCardinality<TItem>
 #endif

Source/Sundew.Base.Development.Tests/Collections/ValueArrayTests.cs

@@ -22,6 +22,15 @@ public void Equals_When_IsDefault_Then_LhsAndRhsShouldBeEqual()
         ((object)lhs).Should().Be(rhs);
     }
 
+    [Test]
+    public void Equals_When_OneIsDefaultAndTheOtherIsEmpty_Then_LhsAndRhsShouldBeEqual()
+    {
+        ValueArray<int> lhs = ValueArray<int>.Empty;
+        ValueArray<int> rhs = default;
+
+        ((object)lhs).Should().Be(rhs);
+    }
+
     [Test]
     public void Equals_When_UsedWithInt_Then_LhsAndRhsShouldBeEqual()
     {

Source/Sundew.Base.Development.Tests/Collections/ValueDictionaryTests.cs

@@ -13,6 +13,15 @@ namespace Sundew.Base.Development.Tests.Collections;
 
 public class ValueDictionaryTests
 {
+    [Test]
+    public void Equals_When_OneIsDefaultAndTheOtherIsEmpty_Then_LhsAndRhsShouldBeEqual()
+    {
+        ValueDictionary<int, int> lhs = ValueDictionary<int, int>.Empty;
+        ValueDictionary<int, int> rhs = default;
+
+        ((object)lhs).Should().Be(rhs);
+    }
+
     [Test]
     public void Equals_When_UsedWithInt_Then_LhsAndRhsShouldBeEqual()
     {

Source/Sundew.Base.Development.Tests/Collections/ValueListTests.cs

@@ -13,6 +13,15 @@ namespace Sundew.Base.Development.Tests.Collections;
 
 public class ValueListTests
 {
+    [Test]
+    public void Equals_When_OneIsDefaultAndTheOtherIsEmpty_Then_LhsAndRhsShouldBeEqual()
+    {
+        ValueList<int> lhs = ValueList<int>.Empty;
+        ValueList<int> rhs = default;
+
+        ((object)lhs).Should().Be(rhs);
+    }
+
     [Test]
     public void Equals_When_UsedWithInt_Then_LhsAndRhsShouldBeEqual()
     {