/**
* CRM_Extension_ClassLoader constructor.
- * @param \CRM_Extension_Mapper|NULL $mapper
- * @param \CRM_Extension_Manager|NULL $manager
+ * @param \CRM_Extension_Mapper|null $mapper
+ * @param \CRM_Extension_Manager|null $manager
* @param bool $relativize
* Whether to store paths in relative form.
* Enabling this may slow-down scanning a bit, and it has no benefit when for on-demand loaders.