[QST] Should cudf.Series.unique return a ndarray or cudf.Series?

[Matt711]

What is your question?
Should cudf.Series.unique return a ndarray or cudf.Series? I'll change this issue if this is a bug.

In [1]: import pandas as pd

In [2]: import cudf

In [3]: type(pd.Series([2,1,3,3]).unique())
Out[3]: numpy.ndarray

In [4]: type(cudf.Series([2,1,3,3]).unique())
Out[4]: cudf.core.series.Series

In [5]: type(pd.unique(pd.Series([2,1,3,3])))
Out[5]: numpy.ndarray

[davidwendt]

I believe this came up recently here: #16417
And not so recently here: #8175

[bdice]

Note that we return a cupy array when cudf.pandas is enabled. (Also discussed in those linked issues.)