ser = pd.Series([1, 1, None, None], dtype="int64[pyarrow]") ser.mode(dropna=True) ser.mode(dropna=False)
With either dropna=True or dropna=False, we get back Series([1], dtype="int64[pyarrow]"). I'd expect that with dropna=True, but expeced to get Series([1, None], dtype="int64[pyarrow]") with dropna=False.
Encountered while trying to fix the mode xfail for string dtype by implementing it in terms of value_counts, which does behave the way I expected.
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