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  1. or download this
    use strict;
use warnings;
...
    Rate    1    2
1 7.70/s   -- -27%
2 10.6/s  38%   --
  2. or download this
    >perl -MDevel::Peek -E "$x=2/1; Dump$x; $y=$x*2; Dump$x; Dump$y"
SV = NV(0xd75628) at 0xd75640
...
  REFCNT = 1
  FLAGS = (IOK,pIOK)
  IV = 4