code: func (l *Traits) Unmarshal(data []byte) error {
  	protoValues := &LabelValues{}
  	err := proto.Unmarshal(data, protoValues)
  	if err != nil {
  		return err
  	}
  	if protoValues.Values == nil {
  		return nil
  	}
  	*l = make(map[string][]string, len(protoValues.Values))
  	for key := range protoValues.Values {
  		(*l)[key] = protoValues.Values[key].Values
  	}
  	return nil
  }
docs: // Unmarshal unmarshals value from protobuf