Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var withProp = function() {
    }
    withProp.prototype = {
     asdf: function() {}
    }
    
    var ownImpl = function() { this.asdf = function() {}; }
    
    var a = new withProp();
    var b = new ownImpl();
  };
</script>

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a.asdf();

b.asdf();

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