Using List.Count on Unity iPhone

this is a little piece of code that works like a charm in the Unity iPhone Editor but doesn't work on the iPhone, throwing an exception in the XCode console at runtime.

GameObject[] gos = GameObject.FindGameObjectsWithTag("TagUsedIngame");
//gos size is 4 in my test
List<GameObject> gosList = new List<GameObject>(gos);//<-- exception

the exception is documented at http://monotouch.net/Documentation/Troubleshoot

System.ExecutionEngineException: Attempting to JIT compile method (wrapper managed-to-managed) Foo[]:System.Collections.Generic.ICollection`1.get_Count () they suggest to write something like

Foo [] array = null;  
int count = ((ICollection<Foo>) array).Count;

which is pretty funny since this code will throw a null deref exception^^

did anyone already solve this issue? It's more related to Mono than to Unity, because it works fine in the Editor. I set .NET in the Player Settings of the Project to 2.1 . Thank you for the time spent reading this wall of text.