src/main/java/org/organicdesign/fp/collections/PersistentVector.java
@Override public E get(int i) {
        E[] node = leafNodeArrayFor(i);
        return node[i & LOW_BITS];
    }
@Override public E get(int i) {
        E[] node = leafNodeArrayFor(i);
        return node[i & LOW_BITS];
    }
Returns the item specified by the given index.