Deprecate ordered=None for CategoricalDtype · Issue #26336 · pandas-dev/pandas (original) (raw)

xref #26327 (comment).

We currently allow CategoricalDtype.ordered to be None. It should just be a bool (default False).

In [8]: CategoricalDtype(categories=None, ordered=None).ordered
# None

categories can be None, which means "infer later on". But (IIRC) we don't do that for ordered.