Return True if there are any NaNs.
Enables various performance speedups.
Examples
>>> s = pd.Series([1, 2, 3, None])
>>> s
0 1.0
1 2.0
2 3.0
3 NaN
dtype: float64
>>> s.hasnans
True
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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.Series.hasnans.html