I ran across this in Section 3.7.4 of
http://www.unicode.org/reports/tr36/
"Use pairs of noncharacter code points in the range FDD0..FDEF. These
are "super" private-use characters, and are discouraged for general
interchange. The transformation would take each nibble of a byte Y, and
add to FDD0 and FDE0, respectively. However, noncharacter code points
may be replaced by U+FFFD ( � ) REPLACEMENT CHARACTER by some
implementations, especially when they use them internally. (Again,
incoming characters must never be deleted, because that can cause
security problems.)"
I'm not sure if this affects the calculus of the Corrigendum.
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Received on Mon Jul 14 2014 - 13:18:53 CDT
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