fn pyo3_get_value_into_pyobject_ref<ClassT, FieldT, Offset>(
    py: Python<'_>,
    obj: *mut PyObject,
) -> PyResult<*mut PyObject>where
    ClassT: PyClass,
    for<'a, 'py> &'a FieldT: IntoPyObject<'py>,
    Offset: OffsetCalculator<ClassT, FieldT>,