Make the various iterators' "setstate" sliently and consistently clip the

index.  This avoids the possibility of setting an iterator to an invalid
state.

Modules/arraymodule.c

@@ -2838,6 +2838,8 @@ arrayiter_setstate(arrayiterobject *it, PyObject *state)
         return NULL;
     if (index < 0)
         index = 0;
+    else if (index > Py_SIZE(it->ao))
+        index = Py_SIZE(it->ao); /* iterator exhausted */
     it->index = index;
     Py_RETURN_NONE;
 }