//! Both features support either blocking I/O using `std::net::TcpStream` or, with feature `tokio`,
//! non-blocking I/O using `tokio::net::TcpStream` from inside a Tokio runtime.
//! Both features support either blocking I/O using `std::net::TcpStream` or, with feature `tokio`,
//! non-blocking I/O using `tokio::net::TcpStream` from inside a Tokio runtime.