The asynchronous nature of the subscription system causes real problems in module-dbus-protocol, as reported here:
It's much easier to avoid bugs with hooks, so the code in module-dbus-protocol that uses the subscription system should be replaced with code that does the same thing with hooks.
I want to fix this before 2.0, so I'm adding this bug to the blocker list. The work is already underway, so I'll assign the bug to myself.
As mentioned on the mailing list, we're punting this to post 2.0.
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