And that needlessly performs a regexp. And since perl still has to do the ascii to numeric conversion, you might as well do it right away. 
{
    no warnings 'numeric';
    $totcalls += $layer3;
}

[download]
And that will even work if $layer3 starts with a negative number or a float. It's a design feature that Perl works this way.

In reply to Re^3: avoid warnings in Copying and Substituting Simultaneously by JavaFan
in thread avoid warnings in Copying and Substituting Simultaneously by mvcorrea

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