code: def test_slice_mixed_object(start, stop, step, expected):
      ser = Series(
          [
              "aafootwo",
              np.nan,
              "aabartwo",
              True,
              datetime.today(),
              None,
              1,
              2.0,
          ]
      )
      result = ser.str.slice(start, stop, step)
      expected = Series(expected, dtype=object)
      tm.assert_series_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
  from pandas.core.strings.accessor import StringMethods
  from pandas.tests.strings import object_pyarrow_numpy
label_desc: Use image node_id 22 for calling a global function with example usage: test_slice_mixed_object(start, stop, step, expected) without return types