in reply to What Are The Rules For Subs And Modules When Fed Wrong Input

Thank you all for your input, contradictory as it sometimes was. It's all pretty academic for me -- for the time being, as I won't be submitting modules to CPAN any time soon -- but it's great to get the input of the community.
($_='jjjuuusssttt annootthheer pppeeerrrlll haaaccckkeer')=~y/a-z//s;print;