docs: def unregister(self, condition_set):
          """
          Unregisters a condition set with the manager.
  
          >>> operator.unregister(condition_set) #doctest: +SKIP
          """
          if callable(condition_set):
              condition_set = condition_set()
          registry.pop(condition_set.get_id(), None)
          registry_by_namespace.pop(condition_set.get_namespace(), None)