protected function _normalizeFields($model, $settings = array()) {
		if (empty($settings)) {
			$settings = $this->settings[$model->alias];
		}
		$result = array();
		foreach ($settings as $flag => $date) {
			if (is_numeric($flag)) {
				$flag = $date;
				$date = false;
			}
			$result[$flag] = $date;
		}
		return $result;
	}