Gorm 为什么Valuer接口只能用值接收器实现？

如题，为什么Valuer接口只能用值接收器实现？

// 实现 driver.Valuer 接口，Value 返回 json value
func (j JSON) Value() (driver.Value, error) {
  if len(j) == 0 {
    return nil, nil
  }
  return json.RawMessage(j).MarshalJSON()
}

使用指针接收器实现Valuer接口在插入数据的时候就会报错

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