The argument is:
new CGI; is potentially wrong, because it you have a subroutine
new in your namespace, it calls that, and not the one in CGI.
However, if you write CGI->new, and you have a subroutine CGI, it will call that instead of new in the class CGI. So, if you want to avoid conflict, write
CGI::->new
will will call the method new in the class CGI, regardless whether you have subroutines new or CGI in your current class.
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