Fixes.

src/Arch.Benchmarks/Benchmark.cs

@@ -1,24 +1,44 @@
 using System.Numerics;
 using Arch.Core;
 using Arch.Core.Extensions;
+using Arch.Core.Utils;
 
 namespace Arch.Benchmarks;
 
 public class Benchmark
 {
     private static void Main(string[] args)
     {
+        /*
         // NOTE: Can this be replaced with ManualConfig.CreateEmpty()?
 #pragma warning disable HAA0101 // Array allocation for params parameter
         var config = new ManualConfig()
             .WithOptions(ConfigOptions.DisableOptimizationsValidator)
             .AddValidator(JitOptimizationsValidator.DontFailOnError)
             .AddLogger(ConsoleLogger.Default)
             .AddColumnProvider(DefaultColumnProviders.Instance);
-#pragma warning restore HAA0101 // Array allocation for params parameter
+#pragma warning restore HAA0101 // Array allocation for params parameter*/
+
+
+        var world = World.Create();
+        var signature = new Signature(typeof(int), typeof(long));
+        for (var index = 0; index <= 1; index++)
+        {
+            world.Create<int>();
+        }
+
+        var desc = new QueryDescription().WithAll<int>();
+        for (var index = 0; index <= 100000; index++)
+        {
+            world.Query(in desc, (ref int i) =>
+            {
+            });
+        }
+
+
 
         // NOTE: Is `-- --job` a typo?
         // Use: dotnet run -c Release --framework net7.0 -- --job short --filter *IterationBenchmark*
-        BenchmarkSwitcher.FromAssembly(typeof(Benchmark).Assembly).Run(args, config);
+        //BenchmarkSwitcher.FromAssembly(typeof(Benchmark).Assembly).Run(args, config);
     }
 }

src/Arch.Benchmarks/QueryBenchmark.cs

@@ -13,7 +13,7 @@ public class QueryBenchmark
     [Params(10000, 100000, 1000000)] public int Amount;
 
     private static readonly ComponentType[] _group = { typeof(Transform), typeof(Velocity) };
-    private readonly QueryDescription _queryDescription = new() { All = _group };
+    private readonly QueryDescription _queryDescription = new(all: _group);
 
     private static World? _world;
 

src/Arch.Tests/Arch.Tests.csproj

@@ -1,14 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
 
     <!--<AllowUnsafeBlocks>true</AllowUnsafeBlocks>-->
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Configurations>Debug;Release;Release-Pure;Release-PureECS;Release-Events;Debug-PureECS;Debug-Events</Configurations>
     <LangVersion>12</LangVersion>
+    <TargetFrameworks>net7.0;net8.0</TargetFrameworks>
     <!--<TreatWarningsAsErrors>true</TreatWarningsAsErrors>-->
   </PropertyGroup>
 

src/Arch/Arch.csproj

@@ -31,7 +31,7 @@ Introduced breaking changes by renaming Group to Component and several other sma
     <RepositoryType>git</RepositoryType>
     <IsPackable>true</IsPackable>
 
-    <LangVersion>11</LangVersion>
+    <LangVersion>12</LangVersion>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Copyright>Apache2.0</Copyright>
 

src/Arch/Core/Query.cs

@@ -226,26 +226,26 @@ public partial struct QueryDescription : IEquatable<QueryDescription>
     ///     An <see cref="Signature"/> of all components that an <see cref="Entity"/> should have mandatory.
     /// <remarks>If the content of the array is subsequently changed, a <see cref="Rebuild"/> should be carried out.</remarks>
     /// </summary>
-    public Signature All { get; private set; } = new();
+    public Signature All { get; private set; } = Signature.Null;
 
     /// <summary>
     ///     An array of all components of which an <see cref="Entity"/> should have at least one.
     /// <remarks>If the content of the array is subsequently changed, a <see cref="Rebuild"/> should be carried out.</remarks>
     /// </summary>
-    public Signature Any { get; private set; } = new();
+    public Signature Any { get; private set; } = Signature.Null;
 
     /// <summary>
     ///     An array of all components of which an <see cref="Entity"/> should not have any.
     /// <remarks>If the content of the array is subsequently changed, a <see cref="Rebuild"/> should be carried out.</remarks>
     /// </summary>
-    public Signature None { get; private set; } = new();
+    public Signature None { get; private set; } = Signature.Null;
 
     /// <summary>
     ///     An array of all components that exactly match the structure of an <see cref="Entity"/>.
     ///     <see cref="Entity"/>'s with more or less components than those defined in the array are not addressed.
     /// <remarks>If the content of the array is subsequently changed, a <see cref="Rebuild"/> should be carried out.</remarks>
     /// </summary>
-    public Signature Exclusive { get; private set; } = new();
+    public Signature Exclusive { get; private set; } = Signature.Null;
 
     /// <summary>
     ///     Initializes a new instance of the <see cref="QueryDescription"/> struct.
@@ -262,7 +262,7 @@ public QueryDescription()
     /// <param name="any">An array of all components of which an <see cref="Entity"/> should have at least one.</param>
     /// <param name="none">An array of all components of which an <see cref="Entity"/> should not have any.</param>
     /// <param name="exclusive">All components that an <see cref="Entity"/> should have mandatory.</param>
-    public QueryDescription(ComponentType[]? all = null, ComponentType[]? any = null, ComponentType[]? none = null, ComponentType[]? exclusive = null)
+    public QueryDescription(Signature? all = null, Signature? any = null, Signature? none = null, Signature? exclusive = null)
     {
         All = all ?? All;
         Any = any ?? Any;
@@ -273,9 +273,22 @@ public QueryDescription(ComponentType[]? all = null, ComponentType[]? any = null
         _hashCode = GetHashCode();
     }
 
-    public QueryDescription(Signature all) : this()
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="QueryDescription"/> struct.
+    /// </summary>
+    /// <param name="all">An array of all components that an <see cref="Entity"/> should have mandatory.</param>
+    /// <param name="any">An array of all components of which an <see cref="Entity"/> should have at least one.</param>
+    /// <param name="none">An array of all components of which an <see cref="Entity"/> should not have any.</param>
+    /// <param name="exclusive">All components that an <see cref="Entity"/> should have mandatory.</param>
+    public QueryDescription(ComponentType[]? all = null, ComponentType[]? any = null, ComponentType[]? none = null, ComponentType[]? exclusive = null)
     {
-        All = all;
+        All = all ?? All;
+        Any = any ?? Any;
+        None = none ?? None;
+        Exclusive = exclusive ?? Exclusive;
+
+        _hashCode = -1;
+        _hashCode = GetHashCode();
     }
 
     /// <summary>