Function tp_new_impl 

pub unsafe fn tp_new_impl<'py, T, const IS_PYCLASS: bool, const IS_INITIALIZER_TUPLE: bool>(
    py: Python<'py>,
    obj: T,
    cls: *mut PyTypeObject,
) -> PyResult<*mut PyObject>
where
    T: PyClassInit<'py, IS_PYCLASS, IS_INITIALIZER_TUPLE>,