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@@ -74,7 +74,8 @@ with all sufficient information, see the ChangeLog file or Redmine
* String#upcase, String#downcase, String#capitalize, String#swapcase and
their bang variants work for all of Unicode, and are no longer limited
- to ASCII. Variations are available with options. See the documentation
+ to ASCII. Supported encodings are UTF-8, UTF-16BE/LE, UTF-32BE/LE, and
+ ISO-8859-1~16. Variations are available with options. See the documentation
of String#downcase for details. [Feature #10085]
* String.new(capacity: size) [Feature #12024]