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Backport PR #61770 on branch 2.3.x (BUG: Fix unpickling of string dtypes of legacy pandas versions) #61793

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meeseeksmachine
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Backport PR #61770: BUG: Fix unpickling of string dtypes of legacy pandas versions

@lumberbot-app lumberbot-app bot added this to the 2.3.1 milestone Jul 7, 2025
@lumberbot-app lumberbot-app bot added Bug Strings String extension data type and string data IO Pickle read_pickle, to_pickle labels Jul 7, 2025
@jorisvandenbossche
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I am adding an ignore for a new numpy deprecation warning. Although it also happens to occur in a pickle test, it is not actually related to the changes in this PR. It just started happening now because the linked numpy PR was merged a few days ago (the same failures can be seen on the 2.3.x branch).
And it is also only for a test that is already removed in the main branch (testing py2 compat in pickle), so just ignoring here seems fine

@jorisvandenbossche jorisvandenbossche merged commit 6c762f3 into pandas-dev:2.3.x Jul 7, 2025
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