It is arguably more common than not to join dataframes on a unique index. Optional check for uniqueness would help to prevent hidden errors and time spent on debugging.
Describe the solution you'd likeDataFrame.join should get a new parameter on_unique that would, if set to True, check if the index/columns on which joining is performed have duplicates and raise error if yes. Default should be False to keep backward compatibility.
Default set to False ensures no issues with compatibility.
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