- use new FindRegistration<>() method for IsTypeRegistered<>() as well

LightweightIocContainer/IocContainer.cs

@@ -608,7 +608,7 @@ namespace LightweightIocContainer
         /// </summary>
         /// <typeparam name="T">The given <see cref="Type"/></typeparam>
         /// <returns>True if the given <see cref="Type"/> is registered with this <see cref="IocContainer"/>, false if not</returns>
-        public bool IsTypeRegistered<T>() => _registrations.Any(registration => registration.InterfaceType == typeof(T)); //TODO: Use FindRegistration<>()?
+        public bool IsTypeRegistered<T>() => FindRegistration<T>() != null;
 
         /// <summary>
         /// The <see cref="IDisposable.Dispose"/> method