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use strict;
use warnings;

...
        'double-s' => make(qw(long double_s)),
        'join-split' => make(qw(long join_split)),
    });

Short string:
               Rate   triple-s join-split   double-s
triple-s   305867/s         --       -31%       -37%
...
triple-s    4775/s         --       -69%       -86%
join-split 15251/s       219%         --       -55%
double-s   33822/s       608%       122%         --

use strict;
use warnings;

...
        '2-sp_r' => make(qw(long double_sp_r)),
        'j-split' => make(qw(long join_split)),
    });

Short string:
            Rate     2-s    2-sp  2-sp_r     3-s  3-sp_r    3-sp j-spl
+it
2-s     114468/s      --    -14%    -26%    -28%    -42%    -47%    -4
+7%
...
2-sp_r   8443/s    331%    316%    173%      1%      --    -28%    -38
+%
3-sp    11694/s    496%    476%    278%     40%     39%      --    -13
+%
3-sp_r  13512/s    589%    566%    337%     62%     60%     16%      -
+-