Feature/multiple fixes

[steweg]

This patch fixes multiple issues:

• defaults function output
• union_types function
• find_path function
• fixes broken tox/lint with python3.12

[samuel-gauthier]

Hi steweg,

I will gladly have a look.

However, could you first conform to the project pull request guidelines?

• can you add unit tests to your commits?
• can you add proper commit logs, and check your commit titles, as described in the project guidelines?
• ideally, could you submit your pull requests by feature, instead of "multiple_fixes", it will make it easier to split amongst the maintainers

Thanks,
Samuel

[steweg]

Closing this PR as it was split based on request to #80, #81, #82, #83