diff --git a/src/Collections/EcsGroup.cs b/src/Collections/EcsGroup.cs
index 09c4be3..7bbcd74 100644
--- a/src/Collections/EcsGroup.cs
+++ b/src/Collections/EcsGroup.cs
@@ -197,7 +197,7 @@ namespace DCFApixels.DragonECS
         public short WorldID
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get { return _source.id; }
+            get { return _source.ID; }
         }
         public EcsWorld World
         {
@@ -477,7 +477,7 @@ namespace DCFApixels.DragonECS
         public void UnionWith(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
+            if (_source.ID != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
             foreach (var entityID in span) { UnionWithStep(entityID); }
         }
@@ -525,7 +525,7 @@ namespace DCFApixels.DragonECS
         public void ExceptWith(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
+            if (_source.ID != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
 #endif
             foreach (var entityID in span) { ExceptWithStep_Internal(entityID); }
         }
@@ -563,10 +563,10 @@ namespace DCFApixels.DragonECS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void IntersectWith(EcsReadonlyGroup group) { IntersectWith(group.GetSource_Internal()); }
         /// <summary>as Intersect sets</summary>
-        public void IntersectWith(EcsSpan span) //TODO протестировать
+        public void IntersectWith(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
+            if (_source.ID != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
 #endif
             foreach (var entityID in span)
             {
@@ -621,7 +621,7 @@ namespace DCFApixels.DragonECS
         public void SymmetricExceptWith(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
+            if (_source.ID != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
 #endif
             foreach (var entityID in span) { SymmetricExceptWithStep_Internal(entityID); }
         }
@@ -688,7 +688,7 @@ namespace DCFApixels.DragonECS
         public bool SetEquals(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
+            if (_source.ID != span.WorldID) { Throw.Group_ArgumentDifferentWorldsException(); }
 #endif
             if (span.Count != Count) { return false; }
             foreach (var entityID in span)
@@ -747,7 +747,7 @@ namespace DCFApixels.DragonECS
         public bool Overlaps(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
+            if (_source.ID != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
             foreach (var entityID in span)
             {
@@ -786,7 +786,7 @@ namespace DCFApixels.DragonECS
         public bool IsSubsetOf(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
+            if (_source.ID != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
             if (Count == 0) { return true; }
             if (span.Count < Count) { return false; }
@@ -815,7 +815,7 @@ namespace DCFApixels.DragonECS
         public bool IsProperSubsetOf(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
+            if (_source.ID != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
             if (Count == 0) { return true; }
             if (span.Count <= Count) { return false; }
@@ -884,7 +884,7 @@ namespace DCFApixels.DragonECS
         public bool IsSupersetOf(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
+            if (_source.ID != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
             if (span.Count > Count) { return false; }
             return IsSupersetOf_Internal(span);
@@ -910,7 +910,7 @@ namespace DCFApixels.DragonECS
         public bool IsProperSupersetOf(EcsSpan span)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (_source.id != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
+            if (_source.ID != span.WorldID) Throw.Group_ArgumentDifferentWorldsException();
 #endif
             if (span.Count >= Count) { return false; }
             return IsSupersetOf_Internal(span);
@@ -1030,7 +1030,7 @@ namespace DCFApixels.DragonECS
         public static EcsGroup Except(EcsSpan a, EcsGroup b)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (a.WorldID != b._source.id) { Throw.Group_ArgumentDifferentWorldsException(); }
+            if (a.WorldID != b._source.ID) { Throw.Group_ArgumentDifferentWorldsException(); }
 #endif
             EcsGroup result = b._source.GetFreeGroup();
             foreach (var entityID in a)
@@ -1085,7 +1085,7 @@ namespace DCFApixels.DragonECS
         public static EcsGroup Intersect(EcsSpan a, EcsGroup b)
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
-            if (a.WorldID != b._source.id) { Throw.Group_ArgumentDifferentWorldsException(); }
+            if (a.WorldID != b._source.ID) { Throw.Group_ArgumentDifferentWorldsException(); }
 #endif
             EcsGroup result = b._source.GetFreeGroup();
             foreach (var entityID in a)
diff --git a/src/EcsAspect.cs b/src/EcsAspect.cs
index baf381b..b5aae81 100644
--- a/src/EcsAspect.cs
+++ b/src/EcsAspect.cs
@@ -225,7 +225,7 @@ namespace DCFApixels.DragonECS
 
             public Iterator(EcsMaskIterator iterator, EcsSpan span)
             {
-                worldID = iterator.World.id;
+                worldID = iterator.World.ID;
                 _span = span;
                 this.iterator = iterator.Iterate(span);
             }
diff --git a/src/EcsMask.cs b/src/EcsMask.cs
index 597b015..5e8b051 100644
--- a/src/EcsMask.cs
+++ b/src/EcsMask.cs
@@ -379,9 +379,9 @@ namespace DCFApixels.DragonECS
 
 
 
-                EmptyMask = CreateEmpty(_staticMasks.Count, world.id);
+                EmptyMask = CreateEmpty(_staticMasks.Count, world.ID);
                 _staticMasks.Add(EmptyMask._staticMask.ID, EmptyMask);
-                BrokenMask = CreateBroken(_staticMasks.Count, world.id);
+                BrokenMask = CreateBroken(_staticMasks.Count, world.ID);
                 _staticMasks.Add(BrokenMask._staticMask.ID, BrokenMask);
             }
             public void Init(ref WorldMaskComponent component, EcsWorld world)
@@ -444,7 +444,7 @@ namespace DCFApixels.DragonECS
                     int[] incs = ConvertTypeCodeToComponentTypeID(staticMask.IncTypeCodes, _world);
                     int[] excs = ConvertTypeCodeToComponentTypeID(staticMask.ExcTypeCodes, _world);
 
-                    result = new EcsMask(staticMask, _staticMasks.Count, _world.id, incs, excs);
+                    result = new EcsMask(staticMask, _staticMasks.Count, _world.ID, incs, excs);
 
                     _staticMasks.Add(staticMask.ID, result);
                 }
diff --git a/src/EcsStaticMask.cs b/src/EcsStaticMask.cs
index 08bb49f..edbb639 100644
--- a/src/EcsStaticMask.cs
+++ b/src/EcsStaticMask.cs
@@ -355,7 +355,6 @@ namespace DCFApixels.DragonECS
             return $"Inc({string.Join(", ", inc)}) Exc({string.Join(", ", exc)})"; // Release optimization
 #endif
         }
-
         internal class DebuggerProxy
         {
             private EcsStaticMask _source;
@@ -388,28 +387,49 @@ namespace DCFApixels.DragonECS
 
 #if DEBUG
         //TODO оптимизировать, так как списки сортированны, наверняка есть способ без хешсета пройтись и не локать треды
-        private static HashSet<int> _dummyHashSet = new HashSet<int>();
-        private static void CheckConstraints(int[] inc, int[] exc)
+        private static void CheckConstraints(EcsTypeCode[] incs, EcsTypeCode[] excs)
         {
-            lock (_dummyHashSet)
-            {
-                if (CheckRepeats(inc)) { throw new EcsFrameworkException("The values in the Include constraints are repeated."); }
-                if (CheckRepeats(exc)) { throw new EcsFrameworkException("The values in the Exclude constraints are repeated."); }
-                _dummyHashSet.Clear();
-                _dummyHashSet.UnionWith(inc);
-                if (_dummyHashSet.Overlaps(exc)) { throw new EcsFrameworkException("Conflicting Include and Exclude constraints."); }
-            }
+            if (CheckRepeats(incs)) { throw new EcsFrameworkException("The values in the Include constraints are repeated."); }
+            if (CheckRepeats(excs)) { throw new EcsFrameworkException("The values in the Exclude constraints are repeated."); }
+            if (HasCommonElements(incs, excs)) { throw new EcsFrameworkException("Conflicting Include and Exclude constraints."); }
         }
-        private static bool CheckRepeats(int[] array)
+        private static bool HasCommonElements(EcsTypeCode[] a, EcsTypeCode[] b)
         {
-            _dummyHashSet.Clear();
-            foreach (var item in array)
+            int i = 0;
+            int j = 0;
+
+            while (i < a.Length && j < b.Length)
             {
-                if (_dummyHashSet.Contains(item))
+                if (a[i] == b[j])
+                {
+                    return true; 
+                }
+                else if (a[i] < b[j])
+                {
+                    i++;
+                }
+                else
+                {
+                    j++; 
+                }
+            }
+            return false;
+        }
+        private static bool CheckRepeats(EcsTypeCode[] array)
+        {
+            if(array.Length <= 0)
+            {
+                return false;
+            }
+            EcsTypeCode lastValue = array[0];
+            for (int i = 1; i < array.Length; i++)
+            {
+                EcsTypeCode value = array[i];
+                if(value == lastValue)
                 {
                     return true;
                 }
-                _dummyHashSet.Add(item);
+                lastValue = value;
             }
             return false;
         }
diff --git a/src/EcsWorld.cs b/src/EcsWorld.cs
index 131598f..369c192 100644
--- a/src/EcsWorld.cs
+++ b/src/EcsWorld.cs
@@ -42,7 +42,7 @@ namespace DCFApixels.DragonECS
     [DebuggerTypeProxy(typeof(DebuggerProxy))]
     public partial class EcsWorld : IEntityStorage, IEcsMember
     {
-        public readonly short id;
+        public readonly short ID;
         private IConfigContainer _configs;
 
         private bool _isDestroyed = false;
@@ -73,6 +73,12 @@ namespace DCFApixels.DragonECS
         private List<IEcsEntityEventListener> _entityListeners = new List<IEcsEntityEventListener>();
 
         #region Properties
+        [Obsolete("Use EcsWorld.ID")]
+        public short id
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get { return ID; }
+        }
         EcsWorld IEntityStorage.World
         {
             get { return this; }
@@ -119,7 +125,7 @@ namespace DCFApixels.DragonECS
             get
             {
                 ReleaseDelEntityBufferAll();
-                return _entityDispenser.UsedToEcsSpan(id);
+                return _entityDispenser.UsedToEcsSpan(ID);
             }
         }
         public int PoolsCount
@@ -166,7 +172,7 @@ namespace DCFApixels.DragonECS
                         Throw.Exception("The world with the specified ID has already been created\r\n");
                     }
                 }
-                id = worldID;
+                ID = worldID;
                 _worlds[worldID] = this;
 
                 _poolsMediator = new PoolsMediator(this);
@@ -191,7 +197,7 @@ namespace DCFApixels.DragonECS
                     EcsDebug.PrintWarning("The world is already destroyed");
                     return;
                 }
-                if (id == NULL_WORLD_ID)
+                if (ID == NULL_WORLD_ID)
                 {
 #if (DEBUG && !DISABLE_DEBUG)
                     Throw.World_WorldCantBeDestroyed();
@@ -202,9 +208,9 @@ namespace DCFApixels.DragonECS
                 _entityDispenser = null;
                 _pools = null;
                 _nullPool = null;
-                _worlds[id] = null;
-                ReleaseData(id);
-                _worldIdDispenser.Release(id);
+                _worlds[ID] = null;
+                ReleaseData(ID);
+                _worldIdDispenser.Release(ID);
                 _isDestroyed = true;
                 _poolTypeCode_2_CmpTypeIDs = null;
                 _cmpTypeCode_2_CmpTypeIDs = null;
@@ -241,12 +247,12 @@ namespace DCFApixels.DragonECS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public ref T Get<T>() where T : struct
         {
-            return ref WorldComponentPool<T>.GetForWorld(id);
+            return ref WorldComponentPool<T>.GetForWorld(ID);
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public ref T GetUnchecked<T>() where T : struct
         {
-            return ref WorldComponentPool<T>.GetForWorldUnchecked(id);
+            return ref WorldComponentPool<T>.GetForWorldUnchecked(ID);
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static ref T Get<T>(int worldID) where T : struct
@@ -341,18 +347,18 @@ namespace DCFApixels.DragonECS
             {
                 ReleaseDelEntityBufferAll();
             }
-            return _entityDispenser.UsedToEcsSpan(id);
+            return _entityDispenser.UsedToEcsSpan(ID);
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public unsafe entlong GetEntityLong(int entityID)
         {
-            long x = (long)id << 48 | (long)GetGen(entityID) << 32 | (long)entityID;
+            long x = (long)ID << 48 | (long)GetGen(entityID) << 32 | (long)entityID;
             return *(entlong*)&x;
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public unsafe EntitySlotInfo GetEntitySlotInfoDebug(int entityID)
         {
-            return new EntitySlotInfo(entityID, _entities[entityID].gen, id);
+            return new EntitySlotInfo(entityID, _entities[entityID].gen, ID);
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool IsAlive(int entityID, short gen)
@@ -392,7 +398,7 @@ namespace DCFApixels.DragonECS
         public bool IsMatchesMask(EcsMask mask, int entityID)
         {
 #if (DEBUG && !DISABLE_DEBUG) || !DISABLE_DRAGONECS_ASSERT_CHEKS
-            if (mask._worldID != id) { Throw.World_MaskDoesntBelongWorld(); }
+            if (mask._worldID != ID) { Throw.World_MaskDoesntBelongWorld(); }
 #endif
             for (int i = 0, iMax = mask._inc.Length; i < iMax; i++)
             {
@@ -821,7 +827,7 @@ namespace DCFApixels.DragonECS
         #region DebuggerProxy
         private EcsSpan GetSpan_Debug()
         {
-            return _entityDispenser.UsedToEcsSpan(id);
+            return _entityDispenser.UsedToEcsSpan(ID);
         }
         protected class DebuggerProxy
         {
@@ -841,7 +847,7 @@ namespace DCFApixels.DragonECS
             }
             public long Version { get { return _world.Version; } }
             public IEcsPool[] Pools { get { return _world._pools; } }
-            public short ID { get { return _world.id; } }
+            public short ID { get { return _world.ID; } }
             public DebuggerProxy(EcsWorld world)
             {
                 _world = world;
diff --git a/src/Executors/EcsQueryExecutor.cs b/src/Executors/EcsQueryExecutor.cs
index 42197dc..b7a13e7 100644
--- a/src/Executors/EcsQueryExecutor.cs
+++ b/src/Executors/EcsQueryExecutor.cs
@@ -28,7 +28,7 @@ namespace DCFApixels.DragonECS
         public short WorldID
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get { return _source.id; }
+            get { return _source.ID; }
         }
         public EcsWorld World
         {
diff --git a/src/Executors/EcsWhereExecutor.cs b/src/Executors/EcsWhereExecutor.cs
index 9928811..46283cc 100644
--- a/src/Executors/EcsWhereExecutor.cs
+++ b/src/Executors/EcsWhereExecutor.cs
@@ -58,7 +58,7 @@ namespace DCFApixels.DragonECS.Internal
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
             if (span.IsNull) { Throw.ArgumentNull(nameof(span)); }
-            if (span.WorldID != World.id) { Throw.Quiery_ArgumentDifferentWorldsException(); }
+            if (span.WorldID != World.ID) { Throw.Quiery_ArgumentDifferentWorldsException(); }
 #endif
             if (_filteredEntities == null)
             {
@@ -71,13 +71,13 @@ namespace DCFApixels.DragonECS.Internal
         public EcsSpan Execute()
         {
             Execute_Iternal();
-            return new EcsSpan(World.id, _filteredAllEntities, _filteredAllEntitiesCount);
+            return new EcsSpan(World.ID, _filteredAllEntities, _filteredAllEntitiesCount);
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public EcsSpan ExecuteFor(EcsSpan span)
         {
             ExecuteFor_Iternal(span);
-            return new EcsSpan(World.id, _filteredEntities, _filteredEntitiesCount);
+            return new EcsSpan(World.ID, _filteredEntities, _filteredEntitiesCount);
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -85,14 +85,14 @@ namespace DCFApixels.DragonECS.Internal
         {
             Execute_Iternal();
             ArraySortHalperX<int>.Sort(_filteredAllEntities, comparison, _filteredAllEntitiesCount);
-            return new EcsSpan(World.id, _filteredAllEntities, _filteredAllEntitiesCount);
+            return new EcsSpan(World.ID, _filteredAllEntities, _filteredAllEntitiesCount);
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public EcsSpan ExecuteFor(EcsSpan span, Comparison<int> comparison)
         {
             ExecuteFor_Iternal(span);
             ArraySortHalperX<int>.Sort(_filteredEntities, comparison, _filteredEntitiesCount);
-            return new EcsSpan(World.id, _filteredEntities, _filteredEntitiesCount);
+            return new EcsSpan(World.ID, _filteredEntities, _filteredEntitiesCount);
         }
         #endregion
     }
diff --git a/src/Executors/EcsWhereToGroupExecutor.cs b/src/Executors/EcsWhereToGroupExecutor.cs
index 111798d..cb2ab97 100644
--- a/src/Executors/EcsWhereToGroupExecutor.cs
+++ b/src/Executors/EcsWhereToGroupExecutor.cs
@@ -57,7 +57,7 @@ namespace DCFApixels.DragonECS.Internal
         {
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
             if (span.IsNull) { Throw.ArgumentNull(nameof(span)); }
-            if (span.WorldID != World.id) { Throw.Quiery_ArgumentDifferentWorldsException(); }
+            if (span.WorldID != World.ID) { Throw.Quiery_ArgumentDifferentWorldsException(); }
 #endif
             if (_filteredGroup == null)
             {
diff --git a/src/Utils/EcsTypeCode.cs b/src/Utils/EcsTypeCode.cs
index c487938..46501c4 100644
--- a/src/Utils/EcsTypeCode.cs
+++ b/src/Utils/EcsTypeCode.cs
@@ -1,4 +1,7 @@
 namespace DCFApixels.DragonECS
 {
-    public enum EcsTypeCode : int { }
+    public enum EcsTypeCode : int
+    {
+        NULL = 0,
+    }
 }
diff --git a/src/Utils/ITemplateNode.cs b/src/Utils/ITemplateNode.cs
index e88fa6c..887dcfc 100644
--- a/src/Utils/ITemplateNode.cs
+++ b/src/Utils/ITemplateNode.cs
@@ -9,13 +9,13 @@ namespace DCFApixels.DragonECS
         public static int NewEntity(this EcsWorld world, ITemplateNode template)
         {
             int e = world.NewEntity();
-            template.Apply(world.id, e);
+            template.Apply(world.ID, e);
             return e;
         }
         public static entlong NewEntityLong(this EcsWorld world, ITemplateNode template)
         {
             entlong e = world.NewEntityLong();
-            template.Apply(world.id, e.ID);
+            template.Apply(world.ID, e.ID);
             return e;
         }
     }