Zig's Asynchronous I/O Revolution: Decoupling Concurrency from Execution Models

Zig is revolutionizing its asynchronous I/O model, aiming to decouple async/await from the execution model for improved code reusability and performance. A new `Io` interface allows users to customize I/O implementations and supports concurrent operations. `io.async` and `Future.await` simplify expressing concurrency without worrying about the underlying execution model. Zig will offer various `Io` implementations, including thread pool, green threads, and stackless coroutines, for different needs and platform compatibility. This enhances Zig's flexibility and efficiency in handling asynchronous I/O while avoiding the common "function color" problem in traditional async programming.