Comment by thrwyexecbrain

I miss the mention of boost::asio in this thread. At first glance this new Io interface feels not that dissimilar to it:

Both are generic interfaces over an event loop/executor supporting async or blocking operations. Both ship a thread-pool and a stackful coroutine backend and both can be used through their respective language's stackless coroutine implementation (co_yield in cpp and yet-unimplemented in zig).