Accessing members of a jsclass Set in javascript -

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how can specific element set in jclass set. there how add not how get. if try 

        var oo = new set([2,4,6,8]);     alert("ok?"+oo.get(2));

i'v tryed acces array 

        var oo = new set([2,4,6,8]);     alert("ok?"+oo[2]);

both of them failed

docs: http://jsclass.jcoglan.com/set.html

make use of .toarray()

    var oo = new set([2,4,6,8]);      alert("ok?"+oo.toarray()[0]);

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