@Override
    public Set<Entry<K, V>> entrySet() {
        return backingMap.entrySet();
//        HashSet<Entry<K, V>> entrySet = new HashSet<Entry<K, V>>();
//        entrySet.addAll(entries);
//        return entrySet;
    }
Implementation of a Map that favors iteration speed rather than
get/put speed.

@author Kirill Vainer
jme3-core/src/main/java/com/jme3/util/ListMap.java