/// This is an encoding for Russian from [RFC 1489](https://tools.ietf.org/html/rfc1489).
///
/// [Index visualization](https://encoding.spec.whatwg.org/koi8-r.html),
/// [Visualization of BMP coverage](https://encoding.spec.whatwg.org/koi8-r-bmp.html)
/// This encoding matches the Windows code page 20866.