foreach($mixed as $key => $value) {
	if (in_array($key, $this->option_flags)) {
		if (is_bool($value)) {
			$_indexed_attr[$key] = $value;
		} elseif (is_string(value) && in_array(trim($value, '\'"'), array('true', 'false'))) {
			if (trim($value) == 'true') {
				$_indexed_attr[$key] = true;
			} else {
				$_indexed_attr[$key] = false;
			}
		} elseif (is_numeric($value) && in_array($value, array(0, 1))) {
			if ($value == 1) {
				$_indexed_attr[$key] = true;
			} else {
				$_indexed_attr[$key] = false;
			}
		} else {
			$compiler->trigger_template_error("illegal value of option flag \"{$key}\"", null, true);
		}
		// must be named attribute
	} else {
		reset($mixed);
		$_indexed_attr[key($mixed)] = $mixed[key($mixed)];
	}
}