Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [0,1,2,3,4,5,6,7,8,9],
        b = [0, {}, 2.0, -0, 4.01, 5, [], 7, 8, 9];
  };
</script>

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for (value in a) {}

for (value in b) {}

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