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use strict;
use warnings;
...
        hash_grep      => sub { hash_grep() }
    }
);

                 Rate setScalar listCompare using_vec OPdiff OPdiffMod
+ified hash_grep OPdiff_undef
setScalar      7.94/s        --        -72%      -98%   -98%          
+ -98%      -98%         -99%
...
OPdiffModified  478/s     5919%       1599%       37%    27%          
+   --       -6%         -27%
hash_grep       510/s     6317%       1712%       46%    36%          
+   7%        --         -22%
OPdiff_undef    652/s     8105%       2217%       87%    74%          
+  36%       28%           --            --