Undesired toggle effect with #states and checkboxes

I’m working on a patch for the Login Disable module, and on the settings page, I want to have two mutually exclusive options so that when one is checked, the other is unchecked. Using the FAPI #states value, I have the following code:

function login_disable_settings_form($form, &$form_state) {   $form = array();    $form['all_users'] = array(     '#type' => 'fieldset',     '#title' => t('All Users'),     '#collapsible' => TRUE,     '#collapsed' => FALSE,   );    $form['all_users']['login_disable_is_active'] = array(     '#type' => 'checkbox',     '#title' => 'Prevent user log in',     '#description' => t('When active the user login form will be disabled for everyone. For roles granted bypass rights they must use the access key defined below.'),     '#default_value' => (bool)variable_get('login_disable_is_active', FALSE),     '#states' => array(       'unchecked' => array(         ':input[name="login_disable_individual"]' => array('checked' => TRUE),       ),     ),   );    $form['all_users']['login_disable_key'] = array(     '#title' => t('Access key (optional)'),     '#description' => t('For added security, a word can be required to be added to the URL.'),     '#type' => 'textfield',     '#size' => 10,     '#default_value' => variable_get('login_disable_key', 'admin'),   );   if (!empty($form['login_disable_key']['#default_value'])) {     $form['login_disable_key']['#description'] .= '<br />' . t('The URL to use to log in is: @url', array('@url' => url('user/login') . '?' . $form['login_disable_key']['#default_value']));   }    $form['all_users']['login_disable_message'] = array(     '#title' => t('End-user message when login is disabled'),     '#description' => t('The message to display to users when login has been disabled.'),     '#type' => 'textfield',     '#size' => 80,     '#default_value' => variable_get('login_disable_message', t('Member access has been temporarily disabled. Please try again later.')),   );    $form['individual'] = array(     '#type' => 'fieldset',     '#title' => t('Indivdual'),     '#collapsible' => TRUE,     '#collapsed' => FALSE,   );    $form['individual']['login_disable_individual'] = array(     '#type' => 'checkbox',     '#title' => t('Disable on user profile'),     '#description' => t('Checking this box allows disabling individual logins on user profile pages.'),     '#states' => array(       'unchecked' => array(         ':input[name="login_disable_is_active"]' => array('checked' => TRUE),       ),     ),   );    $form = system_settings_form($form);    return $form; } 

So as I see it, my code should just uncheck a checkbox when the other checkbox is checked. I also want the option that neither is checked. However, what’s happening is that they are working as a toggle, in that if I uncheck one, the other one is being checked, which is prohibiting the third option of neither of them being checked. Can anyone tell me why I’m getting this effect?

Thanks.

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