Fixed unitycontainer/unity#213

src/Container/Lifetime/LifetimeContainer.cs

@@ -103,6 +103,7 @@ namespace Unity.Container.Lifetime
             lock (_items)
             {
                 disposables = _items.OfType<IDisposable>()
+                                    .Distinct()
                                     .Reverse()
                                     .ToArray();
                 _items.Clear();

src/Strategies/LifetimeStrategy.cs

@@ -4,9 +4,7 @@ using Unity.Builder;
 using Unity.Builder.Strategy;
 using Unity.Exceptions;
 using Unity.Lifetime;
-using Unity.Policy;
 using Unity.Registration;
-using Unity.Storage;
 
 namespace Unity.Strategies
 {