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Akinori MUSHA authored
`japanese-cp932' to `cp932' to fix the problem where saving a source file written in Shift_JIS twice would end up having `coding: japanese-cp932' which Ruby could not recognize. (ruby-mode-set-encoding): Add support for encodings mapped to nil in `ruby-encoding-map'. (ruby-encoding-map): Map `us-ascii' to nil by default, meaning it doesn't need to be explicitly declared in magic comment. (ruby-encoding-map): Add type declaration for better customize UI.
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