code: def test_iskey_numpy_types():
      np = pytest.importorskip("numpy")
      one = np.int64(1)
      assert not iskey(one)
      assert not iskey(("foo", one))
  
imports: from __future__ import annotations
  import pickle
  from collections import namedtuple
  import pytest
  from dask.core import flatten, get, get_dependencies, get_deps, getcycle, has_tasks, ishashable, iskey, istask, literal, preorder_traversal, quote, subs, validate_key
  from dask.utils_test import GetFunctionTestMixin, add, inc
label_desc: Use image node_id 4 for calling a global function with example usage: test_iskey_numpy_types() without return types