Docs for QML variant claims one can use JSON notation

The docs for QML variant type (http://doc.qt.nokia.com/4.7-snapshot/qml-variant.html) says: "The variant type can also hold a copy of a JavaScript object. For example, the animal property below defines a JavaScript object defined with JSON notation".

The animal property below is:

property variant animal :

However, the result of this expression is undefined. Is this a QML or documentation bug?