Failure to load dumped partial function (in older python) properly (in newer python)

[mart-r]

Firstly, it's very much possible that this is not an issue with dill, specifically. But I thought I'd post it here first since that seemed the most relevant to me.

Secondly, it's possible I've overlooked something simple and this is not an actual issue. If so, I do apologise. I did try and look for an existing issue but could not seem to find one.

Now for the issue at hand.

When using dill.dump to save a partial function in python<3.11 the result can not be read off the disk in python3.11 (didn't try 3.12) in a working order. To be specific, the partial method is read off the disk, but cannot be successfully called.

The minimal-ish version I ran into the issue with:
DUMP: https://gist.github.com/mart-r/0f1bb54fa2bad0df470e3f70075156ae
LOAD: https://gist.github.com/mart-r/358f112097cfeca1f05babec469992c0

Scenario 1 (Working on 3.10)

• DUMP on 3.10
• LOAD on 3.10
• Working as expected

Scenario 2 (Working on 3.11)

• DUMP on 3.11
• LOAD on 3.11
• Working as expected

Scenario 3 (NOT WORKING)

• DUMP on 3.10
• LOAD on 3.11
• See an error (TypeError: 'int' object is not callable)

The tests were carried out:

• OS: Ubuntu 22.04.4 LTS kernel 6.5.0-26
• Python3.10.12
  • Latest available on Ubuntu natively
• Python3.11.8
  • Latest available on Ubuntu natively
• dill==0.3.8

PS:
The issue first came to my attention for a bigger gap in python version (as well as a change in dill version). However, I got to this example when trying to figure out what was going wrong.

Any guidance would be much appreciated. Even if it is to go and learn something new.