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* sprintf("%c") is changed to accept a string for which String#size returns
1, even if it is longer than one byte, and to convert a Fixnum via
Fixnum#chr (possibly returning more than one byte). Thus, if the UTF-8
gem is in use, a character will be understood as a single UTF-8 character.
* The change to sprintf depends on the implementation of Fixnum#chr added
to mrbgems/mruby-string-utf8/src/string.c.
This should work with any other gem that implements a multibyte encoding, as
long as it implements String#size and Fixnum#chr as appropriate.
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