code: func verifyTasksMetadata(tasksMetadataRawMsg json.RawMessage) error {
  	var tasksMetadataMap map[string]json.RawMessage
  	json.Unmarshal(tasksMetadataRawMsg, &tasksMetadataMap)
  
  	if tasksMetadataMap["Tasks"] == nil {
  		return notEmptyErrMsg("Tasks")
  	}
  
  	var tasksMetadataArray []json.RawMessage
  	json.Unmarshal(tasksMetadataMap["Tasks"], &tasksMetadataArray)
  
  	if len(tasksMetadataArray) != 1 {
  		return fmt.Errorf("incorrect number of tasks, expected 1, received %d",
  			len(tasksMetadataArray))
  	}
  
  	return verifyTaskMetadata(tasksMetadataArray[0])
  }
docs: // verifyTasksMetadata verifies the number of tasks in tasks metadata.