Duplicate key in civicrm_rules_data_type_info()

This looks like a bug (untested, I'm afraid) because both entries in the array have the same key. It looks from civicrm_rules_action_info as if the second key should be 'mailing'.
 
/**

• Implementation of hook_rules_data_type_info().
  */
  function civicrm_rules_data_type_info() {
     return array(
                  'contact' => array(
                                     'label' => t('Contact'),
                                     'class' => 'rules_data_type_contact',
                                     'savable' => FALSE,
                                     'identifiable' => TRUE,
                                     ),
                  'contact' => array(
                                     'label' => t('Mailing'),
                                     'class' => 'rules_data_type_mailing',
                                     'savable' => FALSE,
                                     ),
                  );
  }