Hi, welcome to the project. For now, it falls back to pure python implementation, which is also a part of official CPython library. If you add _queue, it will enhance the performance. That's the value.
There is already a working version and we lack of many other features, so it is not the first-grade prioritized, but at the same time, no reason to not to do. If you are motivated by that, go fot it! It will be an easy start point to dig in the project.

If you are looking for easy start point to learn how to start RustPython, I will also recommend this features: #3609