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lazy-ffi and utf-8? added by zilti on Fri Jan 26 15:48:48 2018

(define-method (set-attribute (ih <IHandle>) (key <keyword>) (value <string>))
  ((setter attributes) ih (alist-cons key value (attributes ih)))
  (#~IupSetAttribute pointer: (ptr ih) string: (string-upcase (keyword->string key)) string: value))
(define-method (get-attribute (ih <IHandle>) (key <keyword>))
  (#~IupGetAttribute (ptr ih) string: (string-upcase (keyword->string key)) return: string:))
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