Return True if there are any NaNs.
Enables various performance speedups.
Examples
>>> s = pd.Series([1, 2, 3], index=['a', 'b', None])
>>> s
a 1
b 2
None 3
dtype: int64
>>> s.index.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.Index.hasnans.html