func Strval(value interface{}) string { var key string  if value == nil { return key
   } switch value.(type) { case float64:
      ft := value.(float64)
      key = strconv.FormatFloat(ft, 'f', -1, 64) case float32:
      ft := value.(float32)
      key = strconv.FormatFloat(float64(ft), 'f', -1, 64) case int:
      it := value.(int)
      key = strconv.Itoa(it) case uint:
      it := value.(uint)
      key = strconv.Itoa(int(it)) case int8:
      it := value.(int8)
      key = strconv.Itoa(int(it)) case uint8:
      it := value.(uint8)
      key = strconv.Itoa(int(it)) case int16:
      it := value.(int16)
      key = strconv.Itoa(int(it)) case uint16:
      it := value.(uint16)
      key = strconv.Itoa(int(it)) case int32:
      it := value.(int32)
      key = strconv.Itoa(int(it)) case uint32:
      it := value.(uint32)
      key = strconv.Itoa(int(it)) case int64:
      it := value.(int64)
      key = strconv.FormatInt(it, 10) case uint64:
      it := value.(uint64)
      key = strconv.FormatUint(it, 10) case string:
      key = value.(string) case []byte:
      key = string(value.([]byte)) default:
      newValue, _ := json.Marshal(value)
      key = string(newValue)
   } return key
}