diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb1e4e4..a87b553 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 13.0.0 - August 25, 2024
+
+- Changed: Divided `Assign<T>()` into two distinct overloads - with data initialization and without it.
+  This will allow the sets to be used as objects pools.
+- Changed: Order of groups to more common pattern `Group<Include, Exclude, Owned>`.
+
 ## 12.0.0 - August 10, 2024
 
 Devirtualize usages for better inlining and performance.
diff --git a/Runtime/Registry/RegistryExtensions/RegistryEntityExtensions.cs b/Runtime/Registry/RegistryExtensions/RegistryEntityExtensions.cs
index 4633a0a..197b5b9 100644
--- a/Runtime/Registry/RegistryExtensions/RegistryEntityExtensions.cs
+++ b/Runtime/Registry/RegistryExtensions/RegistryEntityExtensions.cs
@@ -75,7 +75,7 @@ public static bool IsAlive(this Registry registry, Entity entity)
 		/// <param name="data"> Initial data for the assigned component. </param>
 		/// <remarks> If the entity is not alive, nothing happens. </remarks>
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
-		public static void Assign<T>(this Registry registry, Entity entity, T data = default)
+		public static void Assign<T>(this Registry registry, Entity entity, T data)
 		{
 			if (!registry.Entities.IsAlive(entity))
 			{
@@ -85,6 +85,21 @@ public static void Assign<T>(this Registry registry, Entity entity, T data = def
 			registry.Assign(entity.Id, data);
 		}
 
+		/// <summary>
+		/// Assigns a component to an entity, without data initialization.
+		/// </summary>
+		/// <remarks> If the entity is not alive, nothing happens. </remarks>
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static void Assign<T>(this Registry registry, Entity entity)
+		{
+			if (!registry.Entities.IsAlive(entity))
+			{
+				return;
+			}
+
+			registry.Assign<T>(entity.Id);
+		}
+
 		/// <summary>
 		/// Unassigns a component from an entity.
 		/// </summary>
diff --git a/Runtime/Registry/RegistryExtensions/RegistryIdExtensions.cs b/Runtime/Registry/RegistryExtensions/RegistryIdExtensions.cs
index 3a06cda..2b06e03 100644
--- a/Runtime/Registry/RegistryExtensions/RegistryIdExtensions.cs
+++ b/Runtime/Registry/RegistryExtensions/RegistryIdExtensions.cs
@@ -94,9 +94,9 @@ public static void Assign<T>(this Registry registry, int id, T data)
 				dataSet.Get(id) = data;
 			}
 		}
-		
+
 		/// <summary>
-		/// Assigns a component to an entity with this ID, regardless of generation.
+		/// Assigns a component to an entity with this ID, regardless of generation, without data initialization.
 		/// </summary>
 		/// <remarks>
 		/// Assigning a component to an entity that is being destroyed can lead to undefined behavior.
diff --git a/package.json b/package.json
index 2d83b64..f8d791a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "massive-ecs",
-  "version": "12.0.0",
+  "version": "13.0.0",
   "displayName": "Massive ECS",
   "unity": "2021.2",
   "description": "Sparse set ECS library made for prediction-rollback netcode.",