本文介绍了在软件开发中灵活调用方法的两大基本原则：让最弱类型进入及让最强类型离开。这两大原则旨在给予调用者尽可能大的灵活性，并使方法能够在更广泛的应用场景中使用。
Let those two small guidelines be here first:
- Let them in with the weakest type
- Let it out with the strongest type
Those two let the caller have as much flexibility as possible when calling a method based on them and also allow the method itself to be used in the widest range of the scenarios
Let the rest next time.
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