This is Perl 5.010000
           Rate  range repeat  isook unpack
range  405773/s     --    -6%    -8%   -46%
repeat 432956/s     7%     --    -2%   -43%
isook  441233/s     9%     2%     --   -42%
unpack 757010/s    87%    75%    72%     --

This is Perl 5.010000
           Rate  range  isook repeat unpack
range  398141/s     --    -7%    -7%   -47%
isook  427913/s     7%     --    -0%   -43%
repeat 429311/s     8%     0%     --   -43%
unpack 751802/s    89%    76%    75%     --

This is Perl 5.010000
           Rate  range repeat  isook unpack
range  415595/s     --    -7%    -8%   -45%
repeat 445365/s     7%     --    -1%   -41%
isook  449974/s     8%     1%     --   -40%
unpack 754290/s    81%    69%    68%     --