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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
If we don’t do this with lists, if we don’t make += do the in place assignment, if we don’t leave it open for types to do their own thing, depending on the circumstances, then there’s no value in += in the first place, because it’s just syntactic sugar for +.
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