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unpack:      1.200000 1.400000 1.800000 12345678.901230 2147483648
custom:      1.200000 1.400000 1.800000 12345678.901230 2147483648
...
unsafe      555156/s          6%          --         -1%        -16%
nonportable 559449/s          7%          1%          --        -15%
unpack      658398/s         26%         19%         18%          --

use strict;
use warnings;
...
printf("unsafe:      %f %f %f %f %u\n", custom_unpack_unsafe($buf));

cmpthese(-2, \%tests);