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use Benchmark qw( cmpthese );

...
return_grep        5.78/s      371%       271%           185%         
+        2%          --              -1%       -3%
bare_scalar_grep   5.82/s      374%       274%           188%         
+        2%          1%               --       -2%
bare_grep          5.93/s      383%       280%           193%         
+        4%          3%               2%        --