Do you prefer:


@attr.s(frozen=True)
class Person(BaseModel):
    """Represents the author/committer of a revision or release."""
    fullname = attr.ib(type=bytes, validator=type_validator())
    name = attr.ib(type=Optional[bytes], validator=type_validator())
    email = attr.ib(type=Optional[bytes], validator=type_validator())

or

@attr.s(frozen=True)
class Person(BaseModel):
    """Represents the author/committer of a revision or release."""
    fullname = attr.ib(type=bytes)
    name = attr.ib(type=Optional[bytes])
    email = attr.ib(type=Optional[bytes])

    fullname.validator(type_validator())
    name.validator(type_validator())
    email.validator(type_validator())