QAbstractItemModel should register the QVector<int> metatype

While running my application I saw this in the logs:

QObject::connect: Cannot queue arguments of type 'QVector<int>'
(Make sure 'QVector<int>' is registered using qRegisterMetaType().)

I was a bit startled, because I'm not even using QVector in my application, at all. After some debugging, I believe that the cause for this warning is that I'm emitting the QAbstractItemModel::dataChanged() signal from a QThread. While I'm passing only two parameters to this signal (the QModelIndex'es of the changed items), the signal has an optional third parameter, which is "const QVector<int> &roles".

While it's easy to workaround this issue by just registering the QVector<int> metatype in my app, I believe that Qt's QAbstractItemModel should do it, since it's the one defining the signal.