I think the name of a count key and a base_name are not enough, need I need to pass a 'params' dictionary or a 'pop' instance in generator method? or I should put them into 'lvsb_option_mapper' dictionary, you know the virttest/utils_params.py Params() class requires a dictionary arguments, but the 'params' or 'pop' key is not what I want when I get key, value from 'lvsb_option_mapper', it means I need to remove them from return list, right?