* Looks up a boolean system wide defined value
*
* @param string $key the key of the value, under which it was saved
- * @param mixed $default the default value to be returned if the value isn't set
+ * @param bool $default the default value to be returned if the value isn't set
*
* @return bool
*
* Looks up an integer system wide defined value
*
* @param string $key the key of the value, under which it was saved
- * @param mixed $default the default value to be returned if the value isn't set
+ * @param int $default the default value to be returned if the value isn't set
*
* @return int
*
* Looks up a string system wide defined value
*
* @param string $key the key of the value, under which it was saved
- * @param mixed $default the default value to be returned if the value isn't set
+ * @param string $default the default value to be returned if the value isn't set
*
* @return string
*