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I've not fully read Tim's response in email, but instead
I've reviewed and discussed the patch with Tim.

I think the only thing to which I object at this point is
the removal of the entry point _PyObject_Del.  I believe
that for source and binary compatibility with 2.2, that
entry point should remain, with the same meaning, but it
should not be used at all by the core. (Motivation to keep
it: it's the only thing you can reasonably stick in tp_free
that works for 2.2 as well as for 2.3.)

One minor question: there are a bunch of #undefs in
gcmodule.c (e.g. PyObject_GC_Track) that don't seem to make
sense -- at least I cannot find where these would be
#defined any more. Ditto for #indef PyObject_Malloc in
obmalloc.c.

I suggest that you check this thing in, but keeping
_PyObject_Del alive, and we'll take it from there.