TryGetRef fix

Author: metalgearsloth

src/Arch.Benchmarks/TryGetBenchmark.cs

@@ -47,12 +47,8 @@ public void TryGetGenericRefFail()
         for (var index = 0; index < _entities.Count; index++)
         {
             var entity = _entities[index];
-            var pos = _world.TryGetRef<Position2D>(entity, out var exists);
-
-            if (!exists)
-            {
-                _consumer.Consume(pos);
-            }
+            _world.TryGetRef<Position2D>(entity, out var exists);
+            _consumer.Consume(exists);
         }
     }
 

src/Arch/Core/World.cs

@@ -1149,12 +1149,17 @@ public ref T TryGetRef<T>(Entity entity, out bool exists)
     {
         ref var slot = ref EntityInfo.EntityData[entity.Id];
 
-        if (!(exists = slot.Archetype.Has<T>()))
+        if (!slot.Archetype.TryIndex<T>(out int compIndex))
         {
+            exists = false;
             return ref Unsafe.NullRef<T>();
         }
 
-        return ref slot.Archetype.Get<T>(ref slot.Slot);
+        exists = true;
+        ref var chunk = ref slot.Archetype.GetChunk(slot.Slot.ChunkIndex);
+        Debug.Assert(compIndex != -1 && compIndex < chunk.Components.Length, $"Index is out of bounds, component {typeof(T)} with id {compIndex} does not exist in this archetype.");
+        var array = Unsafe.As<T[]>(chunk.Components.DangerousGetReferenceAt(compIndex));
+        return ref array[slot.Slot.Index];
     }
 
     /// <summary>