Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var o = {
      "0": "a",
      "1": "b",
      "2": "b",
      "3": "b",
      "4": "b",
      "5": "b",
      "6": "b",
      "7": "b",
      "length": 8,
      "xy": function(asdf) {}
    };
    var arr = new Array();
  };
</script>

Test runner

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for (var i in o)
if (++i) arr.push(o[i - 1])

for (var i in o)
if (+i || i == "0") arr.push(o[i])

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