add property copy and customize encoding/decoding methods #516
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程序员可以在子类重写这两个方法来自定义一些属性的encode/decode,比如一些struct结构体,或者做一些历史版本数据的兼容,就很必要用到这两个方法。
添加的方法:
通过这个方法将一个对象A的属性全部拷贝到已有的对象B上,而不需要新建创建对象