Unable to uncheck all boxes in checkbox group after save/update

[jerwre]

If you've checked boxes in a group and saved your post, you are unable to uncheck all boxes and update it. It won't update, and keeps at least 1 box still checked.

[tammyhart]

I cannot duplicate this bug in my testing, can you paste in your fields array?

[jerwre]

Using WP 3.5.1. As you can see, the fields array is the same as the one on the wiki page.

$prefix = "fvadm_banner_";
$cg = array(
    array(
        'label' => 'Checkbox Group',
        'desc'  => 'A description for the field.',
        'id'    => $prefix . 'checkbox_group',
        'type'  => 'checkbox_group',
        'options' => array (
            'one' => array (
                'label' => 'Option One',
                'value' => 'one'
            ),
            'two' => array (
                'label' => 'Option Two',
                'value' => 'two'
            ),
            'three' => array (
                'label' => 'Option Three',
                'value' => 'three'
            )
        )
    )
);