// if the register already exists, merge it with the incoming state
It is very easy to accumulate tech debt with random PM pet features. Remember that even diffs to intern tools can break prod!
，这一点在im钱包官方下载中也有详细论述
There are some techniques that can be used to reverse a relationship if the flow of logic requires it. For instance, the higher-level module could expose a required interface which will be implemented by the lower-level module. That’s the Dependency Inversion Principle on the module level. One of the other possibilities is to introduce a mediator pattern.
绝大多数人买苹果的手机配件，应该都是点进来，看看价格，关掉网页去买国产平替。
Easy to get up and running in days