I can help to be able to rely on some base class. For example in TpMessageMixin I would like to use tp_base_channel_get_self_handle(). * TpGroupMixin and TpMessageMixin should require to be implemented with TpBaseChannel * TpPresenceMixin should require to be implemented with TpBaseConnection * TpPropertiesMixin probably can't require anything Do we have other mixins?
I guess this isn't a problem. I would argue that most of the time you don't need convenience methods from base classes but we should encourage the use of our base classes. Fine by me.
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