working.put(16, "Jarrah");
working.put(23, "Shephard");
working.put(42, "Kwon");
final DiffNode mapNode = ObjectDifferBuilder.buildDefault().compare(working, base);
mapNode.visitChildren(new DiffNode.Visitor()
{
public void node(final DiffNode node, final Visit visit)
{
final Object key = ((MapKeyElementSelector) node.getElementSelector()).getKey();
// ^^^ I do not encourage this, but currently it's the only way