code: def test_mask_with_boolean_na_treated_as_false(index):
      # https://github.com/pandas-dev/pandas/issues/31503
      ser = Series(range(3))
      idx = Categorical([True, False, None])
      if index:
          idx = CategoricalIndex(idx)
  
      result = ser[idx]
      expected = ser[idx.fillna(False)]
  
      tm.assert_series_equal(result, expected)
  
imports: import math
  import numpy
  import pytest
  from pandas import NA, Categorical, CategoricalIndex, Index, Interval, IntervalIndex, NaT, PeriodIndex, Series, Timedelta, Timestamp
  import pandas._testing
  import pandas.core.common
label_desc: Use image node_id 2 for calling a global function with example usage: test_mask_with_boolean_na_treated_as_false(index) without return types