use_eq: 24 wallclock secs (24.27 usr +  0.00 sys = 24.27 CPU)
use_hash: 27 wallclock secs (27.68 usr +  0.00 sys = 27.68 CPU)
use_return: 23 wallclock secs (22.97 usr +  0.00 sys = 22.97 CPU)
$ ./sort_test.pl
Benchmark: timing 100000 iterations of use_eq, use_hash, use_return ..
use_eq: 24 wallclock secs (23.59 usr +  0.00 sys = 23.59 CPU)
use_hash: 28 wallclock secs (27.75 usr +  0.00 sys = 27.75 CPU)
use_return: 24 wallclock secs (22.86 usr +  0.00 sys = 22.86 CPU)