Avoid .ordered and .categories from being settable in CategoricalColumn and CategoricalDtype #15475
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Description
A rehash of #14979
The
CategoricalDtype.ordered
behavior matchespandas.CategoricalDtype.ordered
behavior.Also combines
as_ordered
andas_unordred
into 1 method, and avoids toas_index
casts that are already performed elsewhereChecklist