didn't prevent libuv from adding support for it when available:

https://github.com/libuv/libuv/issues/1947

libuv is more nearly designed for adding IOCP-like support to epoll systems than epoll to IOCP (though it can approximate either direction), so adding io_uring was already straightforward, by design

Aside: the wepoll mentioned in this repo is a standalone project extracted libuv, for projects that only desire to support Berkeley sockets and don’t care about other events sources (processes or pipes)