Hi Selso,
The current implementation of FastLZ is considered "stable", hence why it doesn't see/need much improvements.
For a good measure, I've updated the README to mention a couple of things:
* where it is being used: from games (as Death Stranding) to various open-source projects (Godot Engine, Facebook HHVM, Apache Traffic Server, Calligra Office, OSv, Netty, etc).
* the CI system verifies the build and runs the tests on 23 different combinations of architectures (amd64,i686, arm64, armhf, mips), operating systems (Linux, macOS, Windows), compilers (Clang, GCC, VS2017/2019, Tiny CC).
* available language bindings to work with it from Rust, Lua, Python, Ruby, etc
If there are more concerns, please let me know. Thank you very much!