/// Namespace for native TLS powered [`TlsStream`](crate::native_tls::TlsStream).
///
/// The underlying crate (`native-tls`) will use _SChannel_ on Windows,
/// _SecureTransport_ on OSX, and _OpenSSL_ on other platforms.
/// Namespace for Rustls-powered [`TlsStream`](crate::rustls::TlsStream).