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  1. or download this
     $ perl -MBenchmark=cmpthese -e'cmpthese( 2e6, {
ri=>sub{return int @_},
...
rs 25000000/s  75%  37%  37%   --   0% -25%
i  25000000/s  75%  37%  37%   0%   -- -25%
s  33333333/s 133%  83%  83%  33%  33%   --
  2. or download this
            Rate   rz   ri    z   rs    i    s
rz 3076923/s   --  -5% *-6%* -9% -11% -15%
...
rs 3389831/s  10%   5%   3%   --  -2% *-7%*
i  3448276/s  12%  *7%*  5%   2%   --  -5%
s  3636364/s  18%  13%  11%  *7%*  5%   --