Hey! I'm still implementing MPRIS in my music player, and I find myself wanting to notify the clients about changes in the state of the application. Whenever the player does something internally (play, pause, etc.), I want it to be reflected on the clients connected to the player, so I need to set the properties from within. However, it seems like I can't do that without making the properties externally writeable (i.e. by adding setters). Is there a way to add private setters?