Q_PROPERTY FINAL feature cannot be safely used

Qt 4.8 documents a new FINAL flag for Q_PROPERTIES. It says these properties must not be reimplemented by subclasses. Unfortunately it also says that there's no checking that this constraint is held, and that the user must do so. Sadly, the user can't do this since the documentation doesn't show which properties are FINAL. The value of this API is questionable anyway, so perhaps it should be removed in qt5?