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use strict;
use warnings;
...
    push @{ $rhRet->{ $_ } }, $idx ++ for @{ $aref };
    return $rhRet;
}

a => [ 0, 2 ]
b => [ 1 ]
...
           Rate wollmers   johngg
wollmers 17.6/s       --     -26%
johngg   24.0/s      36%       --