Not quite sure what you are saying, but neither is behavior different when run as a 'script' versus on the command line via -e, nor is the arithmetic operation 'ignored'.
print 42 * '0 but true', "\n";
print 42 * '0 but zonk', "\n";
Argument "0 but zonk" isn't numeric in multiplication (*) at 0_but.pl
Update: Verfied on ActiveState 5.8.9 and Strawberries 5.10.1, 5.12.3 and 5.14.2.
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