Backport PR #42394 on branch 1.3.x (REGR: unpickling in 1.3.0 DataFrame created in 1.2.x #42345)#42416

Merged

jreback merged 1 commit intopandas-dev:1.3.xfrom

meeseeksmachine:auto-backport-of-pr-42394-on-1.3.x

Jul 6, 2021

Commits on Jul 6, 2021

Backport PR #42394: REGR: unpickling in 1.3.0 DataFrame created in 1.2.x #42345

jbrockmendel
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meeseeksmachine
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