optionwidget_onoff will not set 'off' value when using drupal_execute

When you use drupal_execute to submit a $form_state with a optionwidget_onoff checkbox unchecked the widget will not recognize the value as 'off' since Drupal reports a boolean FALSE for the checkbox when using drupal_execute while the widget expects strictly (===) integer 0.

To reproduce:

Create a new integer or text (type doesnt seem to matter) field with optionwidget_onoff as widget
Supply allowed values:
0|Unchecked
1|Checked
of
"foo"|Unchecked
"bar"|Checked
in case of Text field, again this can probably be anything

Fill out sometype_node_form using drupal_execute

$form_state['values']['field_zzz'][0]['values'] = 0;
drupal_execute('sometype_node_form', $form_state, $node_obj);

field_zzz will stay "NULL" after drupal_execute submits the form.

Patch, please excuse the mercurial diff on my local repo

--- a/httproot/sites/all/modules/cck/modules/optionwidgets/optionwidgets.moduleFri Oct 02 19:02:45 2009 -0400
+++ b/httproot/sites/all/modules/cck/modules/optionwidgets/optionwidgets.moduleFri Oct 02 21:12:27 2009 -0400
@@ -371,7 +371,7 @@
 
   $values = array_values($items);
 
-  if ($element['#type'] == 'optionwidgets_onoff' && ($values[0] === 0)) {
+  if ($element['#type'] == 'optionwidgets_onoff' && ($values[0] == 0)) {
     $keys = array_keys($options);
     $values = array(array_key_exists(0, $keys) ? $keys[0] : NULL);
   }

$values[0] is 0 and type int in case of normal form submit
$values[0] is FALSE and type boolean in case of drupal_execute submit

The widget should allow for both values since semantically they mean the same thing for checkboxes