behaviac is a framework of the game AI development, and it also can be used as a rapid game prototype design tool. behaviac supports the behavior tree, finite state machine and hierarchical task network(BT, FSM, HTN)
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Updated
Nov 2, 2019 - C#


I found a magic source
+athttps://github.com/viewflow/django-fsm/blob/957e1d8535f1e8f31cd6f971f4ec6704eb1f2d9a/django_fsm/__init__.py#L166-L179
It seems undocumented, unless I missed it. It would be cool to have a sentence or two about it somewhere.
Thanks!