Forcing lowercase User-Name with rlm_perl

[Chris]

I basically want User-Name to be forced to lowercase for the duration  
of the request.

I have done the following:

modules {
	perl {
		module = my_perl_module.pm
	}
}

authorize {
	preprocess
	perl
	...
}

Pertinent contents of my_perl_module.pm:

sub authorize {
         $RAD_REQUEST{'User-Name'} =~ tr/A-Z/a-z/;
         return RLM_MODULE_OK;
}


This seems to do what I want.  Is it the correct way to accomplish  
this task?

Thanks.