Sending list<int> in a multipart request

[alihabbash]

I'm trying to send a list (it's not a file) within a multipart request
The api gives me an error the days must be an array
My way of doing it like this:

  @Post(path: Urls.REGISTER)
  @Multipart()
  Future<Response> register({
    @Part(ApiConst.PHONE_NUM_FIELD) required String phone,
    @Part(ApiConst.CONFIRM_CODE_FIELD) required String confirmCode,
    @Part(ApiConst.FIRST_NAME_FIELD) required String firstName,
    @Part(ApiConst.LAST_NAME_FIELD) required String lastName,
    @Part(ApiConst.BIRTH_DATE_FIELD) required String birthDate,
    @Part(ApiConst.GENDER_FIELD) required String gender,
    @Part(ApiConst.CITY_ID_FIELD) required int cityId,
    @Part(ApiConst.NATIONAL_ID_FIELD) required String nationalNum,
    @Part(ApiConst.VEHICLE_ID_FIELD) required int vehicleId,
    @Part(ApiConst.VEHICLE_NUMBER_FIELD) required String vehicleNumber,
    @Part(ApiConst.MADE_YEAR_FIELD) required String madeYear,
    @Part(ApiConst.VEHICLE_COLOR_FIELD) required String vehicleColor,
    @Part(ApiConst.VEHICLE_SUB_BRAND_FIELD) required String vehicleSubBrand,
    @Part(ApiConst.VEHICLE_CLASS_ID_FIELD) required int vehicleClassId,
    @Part(ApiConst.SECOND_WORK_CITY_ID_FIELD) int? secondWorkCity,
    @Part(ApiConst.WORK_DAYS_FIELD) List<int>? workDaysIds,
    @PartFile(ApiConst.VEHICLE_LICENSE_FIELD)
        required String vehicleLicenseFilePath,
    @PartFile(ApiConst.DRIVER_LICENSE_FIELD)
        required String driverLicenseFilePath,
    @PartFile(ApiConst.VEHICLE_REAR_FIELD) required String vehicleRearFilePath,
    @PartFile(ApiConst.VEHICLE_FRONT_FIELD)
        required String vehicleFrontFilePath,
    @PartFile(ApiConst.NON_CONVICTION_FIELD)
        required String nonConvictionFilePath,
  });

[Simouche]

how did you fix this?