Function pylong_visit_digits 

pub(crate) fn pylong_visit_digits<R>(
    obj: Borrowed<'_, '_, PyAny>,
    f: impl FnOnce(bool, i64, Option<&[u32]>) -> PyResult<R>,
) -> PyResult<R>

Available on Py_3_15, or Py_3_14 and non-Py_LIMITED_API only.