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use Sort::Key::Multi qw(ii_keysort);

...
       return \@sorted
   }
   );

             Rate nSubSplit nSubRegex nSubSplit3 stSplit stSplit3 stRe
+gex grtSplit grtRegex grtSplit3  skm
nSubSplit  21.7/s        --      -54%       -61%    -75%     -83%    -
+84%     -85%     -91%      -91% -95%
...
grtSplit3   245/s     1029%      415%       341%    180%      93%     
+78%      69%       1%        -- -43%
skm         431/s     1885%      805%       674%    393%     239%    2
+13%     197%      77%       76%   --