Compute the ExtensionArray of unique values.
Examples
>>> arr = pd.array([1, 2, 3, 1, 2, 3])
>>> arr.unique()
<IntegerArray>
[1, 2, 3]
Length: 3, dtype: Int64
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.api.extensions.ExtensionArray.unique.html