EmployeesEmployee.to_dict() crashes when bank_number_format is null

[Neeklass]

Description

EmployeesEmployee.to_dict() raises an AttributeError when the API returns
null for bank_number_format.

The generated from_dict() method explicitly converts JSON null to Python
None:

bank_number_format = (
    EmployeesEmployeeBankNumberFormat(_bank_number_format)
    if _bank_number_format is not None
    else None
)

However, to_dict() assumes every non-Unset value is an enum:

if not isinstance(self.bank_number_format, Unset):
    bank_number_format = self.bank_number_format.value

Because None is not an Unset, this attempts to access None.value.

Environment

• factorial-api-client==2.0.2
• Python 3.14
• Factorial API version 2026-07-01

Minimal reproduction

from factorial_api_client.generated.models.employees_employee import (
    EmployeesEmployee,
)

employee = EmployeesEmployee(
    id="12345",
    access_id="3543",
    first_name="John",
    last_name="Doe",
    full_name="John Doe",
    company_id="999",
    location_id="888",
    created_at="2026-08-05T00:00:00Z",
    updated_at="2026-08-05T00:00:00Z",
    is_terminating=False,
    attendable=True,
    bank_number_format=None,
)

employee.to_dict()

Actual result

AttributeError: 'NoneType' object has no attribute 'value'

Expected result

employee.to_dict()["bank_number_format"] is None

The model should serialize a nullable bank_number_format without raising an
exception.

Suggested fix

Handle None separately in the generated serializer:

bank_number_format: str | None | Unset = UNSET

if self.bank_number_format is None:
    bank_number_format = None
elif not isinstance(self.bank_number_format, Unset):
    bank_number_format = self.bank_number_format.value

The generated type annotation should also include None:

bank_number_format: EmployeesEmployeeBankNumberFormat | None | Unset = UNSET

A round-trip regression test would cover the issue:

payload = {
    # required employee fields...
    "bank_number_format": None,
}

employee = EmployeesEmployee.from_dict(payload)

assert employee.to_dict()["bank_number_format"] is None