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Heavily based on a patch from Lennart Poettering. This is useful for authentication frameworks such as polkit, but this flag is supposed to be generic, and not be bound to any implementation of such a framework. The dbus specification already clarifies that unknown flags must be ignored, the reference implementation and the other implementations we checked indeed ignore any new flags, hence we should be fine with compatibility here. Bug: https://bugs.freedesktop.org/show_bug.cgi?id=83449
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