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  1. or download this
    <berrybrew use perl-5.12.3_32>
    C:\Users\Peter>perl -MDevel::Peek -lE "$iv=1<<30; for(1..3) { Dump $iv
    +; $iv<<=1; }"
    ...
    <berrybrew use perl-5.12.3_32>
    C:\Users\Peter>perl -V:ivsize
    ivsize='4';