Unicode 4.1 adds a number of characters that are part of GB18030 and HKSCS, but were not previously part of Unicode. This requires updates to the converters for these two encodings. In the past, these characters were mapped into private use areas. The updated decoders should map them to their new Unicode code points, but the encoders should support both the new Unicode code points and the old PUA assignments.

See
http://www.unicode.org/versions/Unicode4.1.0/
for more information.

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