protected function lib_type_of($args)
{
$value = $args[0];
switch ($value[0]) {
case "keyword":
if ($value == self::$true || $value == self::$false) {
return "bool";
}
if ($this->coerceColor($value)) {
return "color";
}
return "string";
default:
return $value[0];
}
}