5.0版本update更新

[little-alei]

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Is your feature request related to a problem? Please describe.
中文: 当使用5.0版本的get，自定义class对象更新，使用update必须返回该对象，我大致猜测是为了更灵活的设计，比如可以返回copywith后的对象，更新一些final的属性。但我认为大多数时候都不会返回新的对象，我认为返回值应该是可选的，具备返回值更替换对象，不具备就是更新对象属性。或者这样设计影响效率的话，可以再增加一个方法，而不是再update上完成

English: When using get in version 5.0, for custom class object updates, when using update, the object must be returned. I roughly guess that this is for a more flexible design. For example, an object after copywith can be returned to update some final attributes. But I think that most of the time a new object will not be returned. I think the return value should be optional. If there is a return value, the object can be replaced. If there is no return value, the object attributes are updated. Or if this design affects efficiency, a new method can be added instead of completing it on update.