private void ToFastReadOnlyTest(Xtensive.Tuples.Tuple t, int count)
 {
     for (int i = 0; i < count; i++)
     {
         t.ToFastReadOnly();
     }
 }
 private void CombinedTest(int count)
 {
     Xtensive.Tuples.Tuple t = Xtensive.Tuples.Tuple.Create(1, 2L, 3, "4", (object)null);
     TupleTest(t, count);
     t = t.ToFastReadOnly();
     TupleTest(t, count);
 }