code: func (m *MapFieldTranslator) Get(id uint64) (interface{}, error) {
  	m.l.RLock()
  	defer m.l.RUnlock()
  	if uint64(len(m.s)) < id {
  		return nil, fmt.Errorf("requested unknown id in MapTranslator")
  	}
  	return m.s[id], nil
  }
docs: // Get returns the value mapped to the given id.