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<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';