public function rules(): array 	{ 		return [ 			'download' => ['boolean'], 			'survey_type' => ['required', Rule::in(SurveyType::baSurveyTypes())], 			'language' => ['nullable', 'string', new Enum(DomainLanguages::class)], 			'public_survey' => ['nullable', 'uuid', 'exists:client_surveys,id'], 			'is_target_group' => ['boolean'], 		]; 	}