--- includes/form.inc (saved version)
+++ includes/form.inc (current document)
@@ -1206,6 +1206,8 @@
 	
     $parents = $element['#parents'];
     $parents[] = $type;
+    $element['#default_value'][$type] = (int) $element['#default_value'][$type]; 
+    $element['#value'][$type] = (int) $element['#value'][$type];
     $element[$type] = array(
       '#type' => 'select',
       '#value' => $element['#value'][$type],