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Hi again,
I fixed a minor bug/omission in my patch.
Also, the etype struct is now gone. Instead,
there is a PyHeaptypeObject definition in object.h
which simply can be used in your own extended
type definition like this:

struct _mytype = {
  PyHeaptypeObject etype;
  int field1;
  PyObject *something;
  char and_so_on[20];
}

But I'm quite convinced that this is not the end of the story.
I would like to solve the issue about how to efficiently call
object methods from C which might be overridden?
I believe we could provide an extension to heap types that
handles this automatically. I'm working on a prototype.

ciao - chris