BUG: set_index() and reset_index() not preserving object dtypes #30870

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trevorbye wants to merge 15 commits intopandas-dev:masterfrom

trevorbye:dtype-patch

Commits on Jan 30, 2020

initial test case
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test change
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changes to set_index to preserve dtype from field
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fixing test error
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removed object type inf from _maybe_casted_values
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missing char
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moved tests
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removing test pkl files
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hard reset
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pep fix
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black
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isort
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restoring actions file
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Commits on Jan 31, 2020

whatsnew entry
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Merge branch 'master' of https://github.com/pandas-dev/pandas into dtype-patch
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