The test_nb from jschoeberl

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wrapping Vector(int) ctor

while wrapping Matrix<int,int> works, the following does not work ???

py::class_<MyVector> (m, "MyVector")
    .def(py::init<size_t>())
    ;

leads to compiler error

/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/nanobind/include/nanobind/nb_class.h:284:44: error: non-constant-expression cannot be narrowed from type 'unsigned long' to 'double' in initializer list [-Wc++11-narrowing]
                new ((Alias *) v.p) Alias{ (detail::forward_t<Args>) args... };
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/nanobind/include/nanobind/nb_class.h:420:14: note: in instantiation of function template specialization 'nanobind::init<unsigned long>::execute<nanobind::class_<ngbla::Vector<>>>' requested here
        init.execute(*this, extra...);
             ^
/Users/joachim/tests/test_nb/nb_bla.cpp:29:6: note: in instantiation of function template specialization 'nanobind::class_<ngbla::Vector<>>::def<unsigned long>' requested here
    .def(py::init<size_t>())
     ^
/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/nanobind/include/nanobind/nb_class.h:284:44: note: insert an explicit cast to silence this issue
                new ((Alias *) v.p) Alias{ (detail::forward_t<Args>) args... };
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                           static_cast<double>(          )
1 error generated.

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