is_pv1_scalar_field(f)
                for f in field.sub_fields  # type: ignore[attr-defined]
            ):
                return False
        return True

    def is_pv1_scalar_sequence_field(field: ModelField) -> bool:
        if (field.shape in sequence_shapes) and not lenient_issubclass(  # type: ignore[attr-defined]
            field.type_, BaseModel
        ):