Node type overriding

[barneydobson]

In addition to using node_type_override to make the Model "see" the Node as that type, you may also need to set the __name__, as some code uses this property to distinguish the type. For example, here which will impact if you are making a custom River subclass. In such a case in the subclass __init__ you would need to set self.__class__.__name__ = "River".

This needs to be updated in the documentation, or (preferably) this kind of behaviour needs to be fixed in some way, as it is not a good way to distinguish Node types.