Behavior of MAX_N Aggregator for duplicate values is counter-intuitive

public class MaxNAggregatorTest {

    @Test
    public void duplicateMaxNValueShouldBeIgnored() {
        Aggregator<Integer> myAggregator = Aggregators.MAX_N(3, Integer.class);
        myAggregator.reset();
        myAggregator.update(1);
        myAggregator.update(2);
        myAggregator.update(3);
        myAggregator.update(3);
        assertEquals(3, Iterables.size(myAggregator.results()));
    }
}