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use warnings;
use strict;
...
loop    278364/s      --    -31%    -32%
reverse 400772/s     44%      --     -2%
plain   407520/s     46%      2%      --

use warnings;
use strict;
...
loop    273062/s      --    -19%    -33%
concat  337646/s     24%      --    -18%
unshift 409595/s     50%     21%      --