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                                            cityblack1

i faced the same problerm, i guess that for i am using windows 10

![image](https://user-images.githubusercontent.com/26688821/94630663-03468e80-02f9-11eb-9ba3-3a7a0b3b73d6.png)

expand function cost additional memery than specified init

> When the values and keys are small, `expand` could take a portion of the total memory. 这个很明显是bug且不符合预期吧。为什么不能逐出一部分空间而是申请新空间呢？