upd

Author: IntoTheDev

Diff for: Runtime/Pool.cs

@@ -3,7 +3,7 @@
 
 namespace ToolBox.Pools
 {
-	public sealed class Pool
+	internal sealed class Pool
 	{
 		private readonly Poolable _prefab = null;
 		private readonly Stack<Poolable> _instances = null;

Diff for: Runtime/PoolInstaller.cs

@@ -3,7 +3,7 @@
 namespace ToolBox.Pools
 {
 	[DefaultExecutionOrder(-9999)]
-	public class PoolInstaller : MonoBehaviour
+	internal sealed class PoolInstaller : MonoBehaviour
 	{
 		[SerializeField] private PoolContainer[] _pools = null;
 

Diff for: Runtime/Poolable.cs

@@ -3,7 +3,7 @@
 namespace ToolBox.Pools
 {
 	[DisallowMultipleComponent]
-	public class Poolable : MonoBehaviour
+	internal sealed class Poolable : MonoBehaviour
 	{
 		private IPoolable[] _poolables = new IPoolable[0];