Added World.IsAlive(EntityReference) for a unified API usage.

src/Arch/Arch.csproj

@@ -23,7 +23,9 @@ Fixed issue where Unsafe.As did not work on .Net 2.1 for the Dangerous-Utils.
 Dangerous API now allows setting/getting of recycled ids.
 Fixed archetype duplication after loading a save.
 Fixed .Add when a newly non registered component was added. 
-Now makes use of the updated and improved JobScheduler 1.1.1.</PackageReleaseNotes>
+Now makes use of the updated and improved JobScheduler 1.1.1.
+ScheduleParallelInlineQuery added.
+Added World.IsAlive(EntityReference);</PackageReleaseNotes>
     <PackageTags>c#;.net;.net6;.net7;ecs;game;entity;gamedev; game-development; game-engine; entity-component-system;stride;unity;godot;</PackageTags>
 
     <PackageProjectUrl>https://github.com/genaray/Arch</PackageProjectUrl>

src/Arch/Core/Entity.cs

@@ -300,21 +300,17 @@ public EntityReference()
     /// </summary>
     /// <param name="world">The <see cref="Entity"/> <see cref="World"/>..</param>
     /// <returns>True if its alive, otherwhise false.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool IsAlive(World world)
     {
-        if (this == Null)
-        {
-            return false;
-        }
-
-        var reference = world.Reference(Entity);
-        return this == reference;
+        world.IsAlive(this);
     }
 #else
     /// <summary>
     ///     Checks if the referenced <see cref="Entity"/> is still valid and alife.
     /// </summary>
     /// <returns>True if its alive, otherwhise false.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool IsAlive()
     {
         if (this == Null)

src/Arch/Core/World.cs

@@ -1466,6 +1466,24 @@ public bool IsAlive(Entity entity)
         return EntityInfo.Has(entity.Id);
     }
 
+    /// <summary>
+    ///     Checks if the <see cref="EntityReference"/> is alive and valid in this <see cref="World"/>.
+    /// </summary>
+    /// <param name="entityReference">The <see cref="EntityReference"/>.</param>
+    /// <returns>True if it exists and is alive, otherwise false.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [Pure]
+    public bool IsAlive(EntityReference entityReference)
+    {
+        if (entityReference == EntityReference.Null)
+        {
+            return false;
+        }
+
+        var reference = Reference(entityReference.Entity);
+        return entityReference == reference;
+    }
+
     /// <summary>
     ///     Returns the version of an <see cref="Entity"/>.
     ///     Indicating how often it was recycled.