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It might be a day or two before I get to this.

Regarding the type of tp_free, could we change it to be
something like:

  typedef void (*freefunc)(void *);
  ...
  freefunc tp_free;

and leave the type of tp_dealloc alone.  Maybe it's too
late now that 2.2 is out and uses 'destructor'.  I don't
see how this relates to binary compatibility though.
Why does it matter if the function takes a PyObject pointer
or a void pointer?  The worse I see happening is that people
could get warnings when they compile their extension
modules.