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@jorisvandenbossche
Description
From a flaky test in geopandas, I observed the following behaviour:
In [1]: pd.__version__
Out[1]: '0.25.0.dev0+791.gf0919f272'
In [2]: from shapely.geometry import Point
In [3]: a = np.array([Point(1, 1), Point(1, 1)], dtype=object)
In [4]: pd.Series(a).duplicated()
Out[4]:
0 False
1 True
dtype: bool
In [6]: print(pd.Series(a).duplicated())
...: print(pd.Series(a).duplicated())
0 False
1 True
dtype: bool
0 False
1 False
dtype: bool
So you see that sometimes it works, sometimes it does not work.
I am also not fully sure how the object hashtable works (assuming duplicated uses the hashtable), as the shapely Point objects are not hashable:
In [9]: pd.Series(a).unique()
...
TypeError: unhashable type: 'Point'