I thought of something. For 
        croak("Usage: MyLib->strToInt(...)");

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do 
        croak("Usage: MyLib->strToInt([passfail])");

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square brackets mean optional arg. "..." means 0 to infinity additional args which is not your case. Some people refuse to RTFM and demand that the usage croaks be the only thing they need to look at to call the func/sub/meth.

In reply to Re^2: xs modifying passed value by bulk88
in thread xs modifying passed value by Festus Hagen

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