multi-array optgroup and default_value

I’ve been experiencing a problem with creating a select with multi-array. It creates nicely “optgroup” but the ‘default_value’ seams to act not like I’ve hoped.
The question I have is: should I add this as a patch or do I violate another multi-array issue?

Here is a detailed explanation of the problem. If I give an array like:

array(peronal => array(first, test, test2), default => array(private, public, current));

And would like to set a default value as:

array(default => 1)

I would expect:

<optgroup label="personal">
 <option value="0">first</option>
 <option value="1">test</option>
 <option value="2">test2</option>
</optgroup>
<optgroup label="default">
 <option value="0">private</option>
 <option value="1" selected="selected">public</option>
 <option value="2">current</option>
</optgroup>

Bot get:

<optgroup label="personal">
 <option value="0">first</option>
 <option value="1" selected="selected">test</option>
</optgroup>
<optgroup label="default">
 <option value="0">private</option>
 <option value="1" selected="selected">public</option>
 <option value="2">current</option>
</optgroup>

Notice both ‘test” as ‘public’ is selected.

When you go to the “form_select_options” function in “from.inc”, you’ll see how the recursion is handled, I’ve played around to make the recursion work like I wanted, only needed to change:
$options .= form_select_options($element, $choice);
to:
if($value_is_array) {
 $rec_el = $element;
 $rec_el['#value'] = $element['#value'][$key];
 $options .= form_select_options($rec_el, $choice);
} else {
 $options .= form_select_options($element, $choice);
}