PERF: Performance improvement on dataframe.update. setitem is doing c… #1
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…opy under the hood and it's not updated in place
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Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new featureAdded type annotations to new arguments/methods/functions.Added an entry in the latestdoc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.