//! In-process duplex byte-stream pipes.
//!
//! Two backends, selected the same way as [`crate::io`] and [`crate::fs`]:
//! - `native` (default): a lock-free duplex pipe built directly on
//! [`crate::lockfree::SpscQueue`] (one ring buffer per direction, single
//! producer/single consumer per ring — exactly what a two-endpoint pipe
//! needs) plus [`crate::lockfree::AtomicWakerSlot`] for backpressure/data-
//! availability notification. No `Mutex`, no per-call heap allocation.
//! - `tokio` (when `native` is off): a thin wrapper over
//! `tokio::io::duplex`.
pub use *;
// NOTE: named `tokio_backend`, not `tokio` — see `io::mod`/`fs::mod` for
// why a local module literally named `tokio` shadows the extern crate.
pub use *;