[Python-3000] pep 3124 plans

[Talin]

Phillip J. Eby wrote:

> The principle downside to this approach is that only one metaclass 
> can provide a __prepare__ dictionary, which means it's even more 
> difficult to combine metaclasses than it is in today's Python -- 
> which means I want to give a little more thought to PEP 3115, to see 
> if there is any way to at least emulate the "derived metaclass rule" 
> for __prepare__, that Python currently enforces for the base classes.

I would love any improvements to PEP 3115 that you can think of.

-- Talin