Message4336

Originally I was thinking we'd use the Py.py2int/float methods to do it 
as that's where the current conversions generally happen. Looking at 
them again, though, they are pretty lame:

    public static int py2int(PyObject o, String msg) {
        if (o instanceof PyInteger) {
            return ((PyInteger) o).getValue();
        }
        Object obj = o.__tojava__(Integer.TYPE);

PyInteger.__tojava__ would already do this for us