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4d65c2a992
This issue dates back to some commits I merged recently, which made encodings like Shift-JIS-2004 use appropriate JIS X 0208 characters to represent backslashes and tildes, rather than single-byte characters which are used in those encodings with a different meaning (for example, in these encodings, 0x5C is used for a halfwidth Yen sign, rather than a backslash). There was an unintended side effect: ISO-2022-JP-2004 was also made to represent backslashes and tildes using JIS X 0208 characters. However, ISO-2022-JP explicitly includes ASCII as one of its selectable character sets, and ISO-2022-JP-2004 is just an extension of ISO-2022-JP. So when converting text to ISO-2022-JP-2004, we can convert Unicode backslashes and tildes to ASCII rather than using the corresponding JIS X 0208 characters.