Preparation code

<script src="http://sjhcockrell.s3.amazonaws.com/downloads/belt.js"></script>
 
<script>
  Benchmark.prototype.setup = function() {
    var array = [1,2,3,4],
        in1 = [2,3,4,5,6],
        in2 = [3,4,5,6,7];
    
    // Belt
    function fn1(){ 
        return arguments[2] ? 
                 B.native_concat(B.native_slice.call(arguments, 1)) :
                 arguments[1];
                 
    }
    
    function fn2() {
        return B.native_concat.apply(B.ArrayInstance, arguments);
    }
  };
</script>

Preparation code output

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fn1(array, in1);

fn2(array, in1);

fn1(array, in1, in2);

fn2(array, in1, in2);

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