- allow updating attach flags during runtime
- pid1: peek into activating message when activating a service
- introduce sd_bus_emit_object_added()/sd_bus_emit_object_removed() that automatically includes the build-in interfaces in the list
- - constructors for bus messages should probably not be OK with a NULL bus pointer
- port to sd-resolve for connecting to TCP dbus servers
- see if we can drop more message validation on the sending side
- add API to clone sd_bus_message objects