[Pyrex] status of weakref support?

[Martijn Faassen]

Hi there,

I read the previous thread about weakref support in Pyrex, and I'm using 
  the following hack now in lxml:

cdef class ElementBase:
      ...

class Element(ElementBase):
     __slots__ = ['__weakref__']

Unfortunately this is rather cumbersome, as I have many Pyrex objects 
which needs to be weakreferencable, and I need to subclass them all and 
worry about constructing the right now. In addition, certain operations 
in Pyrex seem to be capable of 'stripping off' the weakreferenceability 
in a way I do not yet understand; I noticed that if I return an object 
that was originally an Element and I declare its type to be ElementBase 
there's a good chance that this object will not be weakreferenceable...

This complexity could all go away if Pyrex-defined extension objects 
could be weakreferenceable from the start. It would simplify lxml a lot. 
I'm fine with having to declare this somewhere, as long as it's possible.

What's the thinking on what this mechanism should look like in Pyrex?

If nobody else more capable steps up, I might even try writing a patch. 
Any hints on where to start?

Thank you,

Martijn