Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var Thing = function () {};
    Thing.prototype.arg = 1;
    
    ui.benchmarks[0].setup = function () {
      Thing = function ( arg ) { if ( arg !== undefined ) { this.arg = arg } };
      Thing.prototype.arg = 1;
    };
    
  };
</script>

Test runner

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var a = new Thing( 2 );
 

var b = new Thing();
b.arg = 2;
 

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