If garbage collector runs during QML object creation, var properties break

If the garbage collector runs while a QML object is being created, then the var properties of that object become unusable. They cannot be directly referenced and always have a value of undefined, even after being assigned a different value.

The attached example achieves this by forcing garbage collection in an on*Changed handler, but it can happen by chance in long running applications. Run the attached example with "qmlscene bug01.qml". Only the console output of the example is interesting.

I suspect it is related to QQmlVMEMetaObject's weak reference to the var properties array, but I don't know enough about the internals to fix it.