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1.0 Behavior with Holes in Array<br/>
The following tests ensure that filter skips holes in the array it constructs. You should see true printed twice:<br/><br/>
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function passUndefined(element, index, array) {
    return typeof element === "undefined";
}

var arr = [undefined];
var res = arr.filter(passUndefined);
print(res.length == 1 && 0 in res && res[0] === undefined);

arr = new Array(20);
res = arr.filter(passUndefined);
print(res.length == 0);

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