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mongoose 有这个参数 ，就不能save() 了？ 为什么？

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mongoose 有这个参数 ，就不能save() 了？ 为什么？

找很久才发现这个问题，为什么？ 有官方解释吗？

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by (71.8m points)

打印下这个参数的类型，可能类型错误


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