I am getting reports any time I update JEI because FEI is messing with internal classes.

At the very least, please set the version range on your JEI dependency so that it is something like
required-after:JEI@[3.7.0,3.7.1];
This way when JEI updates, players will get a warning that FEI only supports up to version 3.7.1 instead of having it crash.

While i'm trying to always check changes in your repository, i can't always apply changes to FEI right after you applied to JEI. I could set maximum version, but still your internal classes that FEI depends on do not change on each release. And if i would limit it, i would have to update FEI each time you post a new release just with changed max version.

Unless, you have a version number that is incremented only when specific classes change (like second number in forge's version). If so, i would like to know which one so i could use it to range FEI's JEI dependency in between 2 changes that would otherwise break it (before and after).

By the way, i know that a lot of people with FEI crashes come to you. Even though i warned them multiple times. There's a warning in big bold red on FEI's curse page concerning crashes. It seems that nobody reads it.

That is the nature of this project, it is your choice to do it this way. I support an API with versioning already, I do not support using or altering my internal classes. If you want to be responsible about it please set a maximum version. I have even improved the missing mods screen with this type of situation in mind, so players are not confused. People will be clearly informed that they should downgrade JEI to be able to play, instead of having their game broken and coming to me saying it crashes.

I saw your PR already, partially guessing where it came from.
I'll see what i can do about it (method existence checks). In the worst case, i will simply set maximum version.

Thank you!