/// This the most notable one of the DOS Cyrillic code pages. It has the same | |
/// box drawing characters as code page 437, so it can be used for decoding | |
/// DOS-era ASCII + box drawing data. | |
/// | |
/// [Index visualization](https://encoding.spec.whatwg.org/ibm866.html), | |
/// [Visualization of BMP coverage](https://encoding.spec.whatwg.org/ibm866-bmp.html) | |
/// | |
/// This encoding matches the Windows code page 866. |