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> One thing which I don't like about your API change is that
> you removed the Py_UNICODE*data, int size style arguments
> --
> this makes it impossible to use the new APIs on non-Python
> data or data which is not available as Unicode object.

Another problem is, that the callback requires a Python
object, so in the PyObject *version, the refcount is
incref'd and the object is passed to the callback. The
Py_UNICODE*/int version would have to create a new Unicode
object from the data.