foreach on generics containers will allocate on the heap?

Hi, guys,

I just find out in Unity's profiler that calling foreach on a generic container will create garbage on heap( around 24B ).

And there's no garbage if I use the GetEnumerator and MoveNext() to run loop on the container.

That's kind of weird, because it doesn't seem to create garbage in a program compiled with Microsoft's .Net ( I didn't see such memory allocation with VisualStudio's profiler )

 List<int> m_lst = new List<int>();
 void Update()
 {
    foreach(var i in m_lst ){} //allocate 24B every frame
 }

Is it always like this? or just because I upgraded to Unity4.3? Could someone give a definite answer or take a test on older version of unity?