Here's a patch that drops adding __definition_order__.  You can get the same effect by adding `__definition_order__ = list(locals())` at the bottom of your class definition.  The benefit of having `__definition_order__` is that the information is automatically available for later use rather than forcing the class author to add the above line in order to benefit from external introspection/manipulation.  The downside is that every syntax-defined class will have the extra attribute with the list of definition order, which might be an unnecessary waste, even if not a huge one.

Ultimately, I'd prefer to keep `__definition_order__`.