docs: def toggle_state(self, state, active=TOGGLE):
          """
          Toggle the given state for this conversation.
  
          The state will be set ``active`` is ``True``, otherwise the state will be removed.
  
          If ``active`` is not given, it will default to the inverse of the current state
          (i.e., ``False`` if the state is currently set, ``True`` if it is not; essentially
          toggling the state).
  
          For example::
  
              conv.toggle_state('{relation_name}.foo', value=='foo')
  
          This will set the state if ``value`` is equal to ``foo``.
          """
          if active is TOGGLE:
              active = not self.is_state(state)
          if active:
              self.set_state(state)
          else:
              self.remove_state(state)