MapKeyElementSelector.getKey() is deprecated

[adzubla]

When visiting a map change, i need access to the map key. I'm doing this:

    ElementSelector elementSelector = node.getPath().getLastElementSelector();
    if (elementSelector instanceof MapKeyElementSelector) {
        Object key = ((MapKeyElementSelector) elementSelector).getKey();
        ...
    }

But the getKey() method is deprecated. Is there another way to achieve this?
If not, I think that the getKey() is useful and should not be deprecated.