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a,b = testit (256) a

I'm trying out user-defined data type for numpy, but I'm a bit stuck. Maybe someone can spot the problem? I'm creating a descr like this: PyArray_Descr * d = (PyArray_Descr*)(PyObject_New (PyArray_Descr, &PyArrayDescr_Type)); d->typeobj = typeptr; d->kind = 'O'; // ??? d->type = 'z'; d->byteorder = '='; d->hasobject = 0; d->elsize = sizeof (cmplx_int_t); d->alignment = __alignof__ (cmplx_int_t); d->subarray = 0; d->fields = 0; d->names = 0; PyArray_ArrFuncs * f = new PyArray_ArrFuncs; PyArray_InitArrFuncs (f); f->copyswapn = ©swapn<cmplx_int_t>; f->copyswap = ©swap<cmplx_int_t>; f->getitem = &getitem<cmplx_int_t>; f->setitem = &setitem<cmplx_int_t>; d->f = f; incref (typeptr); Then register: PyArray_RegisterDataType (d1); This seems OK, I get a typenum 256. But if I try to use it, bad things happen. This tests creating an array, both from typenum and from descr: PyArray_Descr* descr = PyArray_DescrFromType (typenum); npy_intp dims[] = {10}; PyObject * o1 = PyArray_NewFromDescr (&PyArray_Type, descr, 1, dims, 0, 0, 0, 0); PyObject * o2 = PyArray_New (&PyArray_Type, 1, dims, descr->type_num, 0, 0, 0, 0, 0); If I try this for typenum=1, it's fine. But if I use my typenum=256 I get python: Objects/typeobject.c:1418: extra_ivars: Assertion `t_size >= b_size' failed. Program received signal SIGABRT, Aborted. 0x0000003834c30ec5 in raise () from /lib64/libc.so.6