message: serializer join(,) but only for array of stings
diff: @@ -454,7 +454,11 @@ export class ObjectSerializer {
  let date = data[index];
  transformedData.push(ObjectSerializer.serialize(date, subType));
  }
  - return transformedData.join(',');
  + if(subType === 'string') {
  + return transformedData.join(',')
  + } else {
  + return transformedData
  + }
  } else if (type === "Date") {
  return data.toISOString();
  } else {
  