'age_limit': try_get(series_meta, lambda x: self._AGE_RATINGS[x['age_restriction'][0]['code']]),
'cast': traverse_obj(series_meta, (('starring', 'creator', 'writer'), ..., 'name'),
expected_type=lambda x: strip_or_none(x) or None),
'age_limit': try_get(series_meta, lambda x: self._AGE_RATINGS[x['age_restriction'][0]['code']]),
'cast': traverse_obj(series_meta, (('starring', 'creator', 'writer'), ..., 'name'),
expected_type=lambda x: strip_or_none(x) or None),