<!-- If you intend to contribute repeatedly to our project, it is a good idea to join our discord channel. We set ranks for our contributors and give them access to special resources or knowledge: https://discord.com/invite/DasJqPba)
Do not remove the instructions below about testing, they will help users to test your PR -->
**REMEMBER**: when testing a PR that changes something **generic** (i.e. a part of code that handles more than one specific thing), the tester should not only check that the PR does its job (e.g. fixing spell XXX) but **especially** check that the PR does not cause any regression (i.e. introducing new bugs).
**For example**: if a PR fixes spell X by changing a part of code that handles spells X, Y, and Z, we should not only test X, but **we should test Y and Z as well**.