CategoricalIndex.ravel(order='C')
CategoricalIndex.set_value(arr, key, value)
CategoricalIndex.as_unordered(*args, **kwargs)
CategoricalIndex.is_type_compatible(kind)
CategoricalIndex.ndim return the number of dimensions of the underlying data, by definition 1
CategoricalIndex.holds_integer()
CategoricalIndex.astype(dtype, copy=True)
CategoricalIndex.asof_locs(where, mask)
CategoricalIndex.set_names(names, level=None, inplace=False)
CategoricalIndex.union(other)
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