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/// The decoder for this encoding is the same as the decoder for gb18030.
/// The encoder side of this encoding is GBK with Windows code page 936 euro
/// sign behavior. GBK extends GB2312-80 to cover the CJK Unified Ideographs
/// Unicode block as well as a handful of ideographs from the CJK Unified
/// Ideographs Extension A and CJK Compatibility Ideographs blocks.
///
/// Unlike e.g. in the case of ISO-8859-1 and windows-1252, GBK encoder wasn't
/// unified with the gb18030 encoder in the Encoding Standard out of concern
/// that servers that expect GBK form submissions might not be able to handle
/// the four-byte sequences.
///
/// [Index visualization for the two-byte sequences](https://encoding.spec.whatwg.org/gb18030.html),
/// [Visualization of BMP coverage of the two-byte index](https://encoding.spec.whatwg.org/gb18030-bmp.html)
///
/// The encoder of this encoding roughly matches the Windows code page 936.
/// The decoder side is a superset.