Can't access javascript objects' properties

I'm not sure if this is a bug or a known limitation. If latter then please assign this to the documentation project and ask them to mention the limitation here: http://doc.qt.nokia.com/4.7-snapshot/qdeclarativejavascript.html#qml-javascript-restrictions

import Qt 4.7

Rectangle {
    width: 600
    height: 600

    property variant a

    Component.onCompleted: {
        a = {"name":"arska","occupation":"baker"};
        console.log(a);
        console.log(a.name);
        console.log(a['name']);
     }
}

The output is:

[object Object]
undefined
undefined

instead of the expected:

[object Object]
arska
arska