概述
我想你可以查看NA type promotions：
When introducing NAs into an existing Series or DataFrame via reindex or some other means,boolean and integer types will be promoted to a different dtype in order to store the NAs. These are summarized by this table:
Typeclass Promotion dtype for storing NAs floating no change object no change integer cast to float64 boolean cast to object
While this may seem like a heavy Trade-off,in practice I have found very few cases where this is an issue in practice. Some explanation for the motivation here in the next section.
总结
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