[development] Why $form['#post'] is cloned for each element instead of beeing passed by reference ?

Hi, Is there any reason to a valued affectation of $form['#post'] instead of a reference affectation ? In form.inc, function form_builder, line 892, there is foreach (element_children($form) as $key) { $form[$key]['#post'] = $form['#post']; why not just a $form[$key]['#post'] = &$form['#post']; ? Thx -- Daniel