Python and std::vector<unsigned long>

Hello,
why is the template specialization of std::vector<unsigned long> done with
PyInt_* functions? If you use an unsigned long, you normally expect that the 
value might be greater than the greatest signed long. In case of such big 
integers you have then negative integers if you use PyInt. The disadvantage 
of PyLong is the size increase and I suppose slower computation. Does anyone 
now how to use PyInt and interpret them as unsigned in Python?

namespace std {
        specialize_std_vector(unsigned long,PyInt_Check, \
                PyInt_AsLong,PyInt_FromLong);
}

Ciao
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