Bindable-only properties of type qreal/double don't work from QML

    Q_PROPERTY(qreal x BINDABLE getBindableX FINAL)
    Q_PROPERTY(qreal y BINDABLE getBindableY FINAL)
    Q_PROPERTY(qreal z BINDABLE getBindableZ FINAL)
    Q_PROPERTY(qreal width BINDABLE getBindableWidth FINAL)
    Q_PROPERTY(qreal height BINDABLE getBindableHeight FINAL)
    Q_PROPERTY(bool bVisible BINDABLE getBindableVisible FINAL) 

    QProperty<qreal> m_X;
    QProperty<qreal> m_Y;
    QProperty<qreal> m_Z;
    QProperty<qreal> m_Width;
    QProperty<qreal> m_Height;
    QProperty<bool> m_bVisible; 

QBindable<qreal> PropertyClass::getBindableX() const
{
    return &m_X;
}