/usr/lib/s9fes/help/char-upcase is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 | R4RS 6.6 (char-upcase char) ==> char
(char-downcase char) ==> char
These procedures return a character CHAR2 such that
(char-ci=? char char2) ==> #t.
In addition, if CHAR is alphabetic, then the result of CHAR-UPCASE
is upper case and the result of CHAR-DOWNCASE is lower case.
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