Why does isinstance return the wrong value only inside a series map?

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Chapters
00:00 Question
01:02 Accepted answer (Score 3)
02:45 Answer 2 (Score 1)
03:31 Thank you

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Full question
https://stackoverflow.com/questions/5033...

Accepted answer links:
[source]: https://github.com/pandas-dev/pandas/blo...
[extension type]: https://pandas.pydata.org/pandas-docs/st...

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