diff --git a/package.json b/package.json
index e205bfc..e8fcc56 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "displayName": "LeoECS Lite",
     "description": "LeoECS Lite - легковесный ECS-фреймворк, основанный на структурах. Производительность, нулевые или минимальные аллокации, минимизация использования памяти, отсутствие зависимостей от любого игрового движка - это основные цели данного фреймворка.",
     "unity": "2020.3",
-    "version": "2023.9.22",
+    "version": "2023.11.22",
     "keywords": [
         "leoecslite",
         "leoecs",
diff --git a/src/entities.cs b/src/entities.cs
index eac3216..fab17ca 100644
--- a/src/entities.cs
+++ b/src/entities.cs
@@ -11,14 +11,26 @@
 
 namespace Leopotam.EcsLite {
     public struct EcsPackedEntity {
-        internal int Id;
-        internal int Gen;
+        public int Id;
+        public int Gen;
+
+        public override int GetHashCode () {
+            unchecked {
+                return (23 * 31 + Id) * 31 + Gen;
+            }
+        }
     }
 
     public struct EcsPackedEntityWithWorld {
-        internal int Id;
-        internal int Gen;
-        internal EcsWorld World;
+        public int Id;
+        public int Gen;
+        public EcsWorld World;
+
+        public override int GetHashCode () {
+            unchecked {
+                return ((23 * 31 + Id) * 31 + Gen) * 31 + (World?.GetHashCode () ?? 0);
+            }
+        }
 #if DEBUG
         // For using in IDE debugger.
         internal object[] DebugComponentsView {
diff --git a/src/worlds.cs b/src/worlds.cs
index 555e3db..b4f4c22 100644
--- a/src/worlds.cs
+++ b/src/worlds.cs
@@ -616,12 +616,14 @@ public EcsFilter End (int capacity = 512) {
                 Array.Sort (Include, 0, IncludeCount);
                 Array.Sort (Exclude, 0, ExcludeCount);
                 // calculate hash.
-                Hash = IncludeCount + ExcludeCount;
-                for (int i = 0, iMax = IncludeCount; i < iMax; i++) {
-                    Hash = unchecked (Hash * 314159 + Include[i]);
-                }
-                for (int i = 0, iMax = ExcludeCount; i < iMax; i++) {
-                    Hash = unchecked (Hash * 314159 - Exclude[i]);
+                unchecked {
+                    Hash = IncludeCount + ExcludeCount;
+                    for (int i = 0, iMax = IncludeCount; i < iMax; i++) {
+                        Hash = Hash * 314159 + Include[i];
+                    }
+                    for (int i = 0, iMax = ExcludeCount; i < iMax; i++) {
+                        Hash = Hash * 314159 - Exclude[i];
+                    }
                 }
                 var (filter, isNew) = _world.GetFilterInternal (this, capacity);
                 if (!isNew) { Recycle (); }