[plt-scheme] small Unicode changes

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Sat Mar 1 09:23:26 EST 2008

In addition to using Unicode 5.0 instead of 4.1, the default UTF-8
decoding of a port stream now produces #\uFFFD (the "replacement
character") instead of #\? for bad encodings in the stream.

Matthew



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