We're serious in the sense of very much alpha, and with a long way to go, hopefully intersecting with Zig's stability program in the next year or so, but we have some demos and benchmarks in there of using Zig for io_uring. Zig's std lib already has io_uring helpers based on liburing's design, which we contributed.
We would have gone with C for its ABI, OOM-safety and control over memory layout, but considered Zig ready enough given our own medium term timeline, and the developer velocity and safety is already paying off. We also wanted a fantastic compiler, which Zig already provides. I personally wouldn't go back to C for a new project like this.
Disclaimer: I'm not a Zig expert at all, and the project doesn't really require most Zig features that differ from C. But I think writing small and "for-fun" projects like this is important for getting used to a language. I think one of Zig's big qualities is that it is so straightforward, after a few hundred lines you hardly have to look up things in the language documentation anymore.
