Thank you for raising this issue and submitting a PR (thanks also for the minor changes to the README and Contributing files!).

Unfortunately, some tests are failing, but this is unrelated to your PR (Poetry dropped support for Python 3.9 at the beginning of the year: https://python-poetry.org/blog/announcing-poetry-2.3.0/). I will address that soon in a futur PR.

Thanks for the message, the explanation... and the merge :)
I apologize for the bugs, I should have tested more thoroughly before submitting the first time.
But the changes are field tested ;)