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MicroSoft invented three encodings very similar to ISO-2022-JP/JIS7/JIS8, called CP50220, CP50221, and CP50222. All three are supported by mbstring. Since these encodings are very similar, some code can be shared. Actually, conversion of CP50220/1/2 to Unicode is exactly the same operation; it's when converting from Unicode to CP50220/1/2 that some small differences arise in how certain katakana are handled. The most important common code was a function called `mbfl_filt_wchar_jis_ms`. The `jis_ms` part doubtless refers to the fact that these encodings are modified versions of 'JIS' invented by 'MS'. mbstring also went a step further and exported 'JIS-ms' to userland as a separate encoding from CP50220/1/2. If users requested 'JIS-ms' conversion, they got something like CP50220/1/2, minus their special ways of handling half-width katakana when converting from Unicode. But... that 'encoding' is not something which actually exists in the world outside of mbstring. CP50220/1/2 do exist in MicroSoft software, but not 'JIS-ms'. For a text encoding conversion library, inventing new variant encodings and implementing them is not very productive. Our interest is in handling text encodings which real people actually use for... you know, storing actual text and things like that.