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use strict;
use warnings;
...
        
    return \@results;
}

Run 1:
                         Rate shuffled_arrayLookup hashLookup shuffled
+_hashLookup arrayLookup
...
arrayLookup          414491/s         1%                   0%         
+ --                 -1%
shuffled_hashLookup  416667/s         1%                   1%         
+ 1%                  --