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FWIW, I now think (after some talk on a private Unicode list) that it's correct to allow surrogates as Scheme characters; that is, the range of char->integer should be 0 to #x10FFFF.
Hmm. That would seem to prevent an implementation representing strings internally using UTF-8. This is convenient in some contexts as Scheme strings can be trivially converted to UTF-8 C strings.
Regards, Alan -- Dr Alan Watson Centro de Radioastronomía y Astrofísica Universidad Astronómico Nacional de México