chibi-scheme/lib/srfi/166/unicode.sld

(define-library (srfi 166 unicode)
  (import (scheme base)
          (scheme char)
          (srfi 130)
          (srfi 151)
          (srfi 166 base))
  (export as-unicode
          unicode-terminal-width unicode-terminal-width/wide
          upcased downcased)
  (include "width.scm"
           "unicode.scm"))