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use strict;
use warnings;
...
cmpthese -5,\%subs;

__END__

Benchmark: running list_io, split_slurp, while_io, each for at least 5
+ CPU seconds...
   list_io:  5 wallclock secs ( 3.89 usr +  1.34 sys =  5.24 CPU) @ 17
+21.98/s (n=9018)
...
while_io    1629/s          --         -5%        -40%
list_io     1722/s          6%          --        -37%
split_slurp 2725/s         67%         58%          --