Method: Registers a set of PSR-4 directories for a given namespace, replacing any others previously set for this namespace.

Method: Turns on searching the include path for class files.

Method: Can be used to check if the autoloader uses the include path to check for classes.

Method: Turns off searching the prefix and fallback directories for classes that have not been registered with the class map.

Method: Should class lookup fail if not found in the current class map?

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