Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
        b = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    
    b.fuck = "fuck";
  };
</script>

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a[0];

b[0];

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