BUG: disallow scalar in CategoricalIndex construtor by jbrockmendel · Pull Request #38614 · pandas-dev/pandas (original) (raw)

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This is not actually about passing scalar data, but about passing no data (eg pd.CategoricalIndex(categories=['a', 'b'])). We generally support constructors with passing no data to create an empty (eg Series also allows this).

So I would either keep supporting this, or either it should at least be deprecated (this eg breaks dask)