`save_function()` can't save function in a submodule that has the same name as an attribute of the parent module about dill HOT 2 CLOSED

Python 3.11.6 (main, Oct  2 2023, 18:01:19) [Clang 13.1.6 (clang-1316.0.21.2.5)] on darwin
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>>> import dill
>>> import tempfile
>>> import test_module
>>> file = tempfile.TemporaryFile()
>>> dill.copy(file)
<_io.BufferedRandom name=3>
>>> dill.copy(test_module.test)
<function test at 0x101ee28e0>
>>> dill.copy(test_module.test_function)
<function test_function at 0x101d0c5e0>
>>> 
>>> dill.Pickler(file).save(test_module.test)
>>> dill.Pickler(file).save(test_module.test_function)
>>> dill._dill.StockPickler(file).save(test_module.test)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/pickle.py", line 560, in save
    f(self, obj)  # Call unbound method with explicit self
    ^^^^^^^^^^^^
  File "/Users/mmckerns/lib/python3.11/site-packages/dill/_dill.py", line 1940, in save_function
    for stack_element in _postproc:
TypeError: 'NoneType' object is not iterable
>>> 

import joblib
joblib.hash(test_module.test_function)