class Configuration: JSON_FIELD: dict = field(converter=json.loads) KV_FIELD: dict = field(converter=csv_pairs)
class Config: FIELD: int = field(validator=range(3))
class Config: FIELD: int = field(validator=1)
class Config: FIELD: int = field(validator=lambda x: x % 2 == 0)
class Config: FIELD: str = field(validator="abcd")
class Config: FIELD: int = field(validator=[1, 3, 4])