If you're a modder and you wish to suffer less, well, here's this.
This project replaces Sponge's (classic) Mixin which is used by (Neo)Forge with Fabric's version that has more features (like interface and constructor injections).
Some mods may use this project to modify the game in a more compatible way.
Modders just need to depend on this mod and have users install it, and it will replace the Mixin version at runtime by replacing its module source.