The FAQ http://www.unicode.org/faq/private_use.html#sentinels
says that the last 2 code points on the planes except BMP were made
noncharacters in TUS 3.1. DerivedAge.txt gives 2.0 for these.
"The conformance wording about U+FFFE and U+FFFF changed somewhat in
Unicode 2.0, but these were still the only two code points with this
unique status"
Unicode 3.1 [2001] was the watershed for the development of
noncharacters in the standard. Unicode 3.1 was the first version to add
supplementary characters to the standard. As a result, it also had to
come to grips with the fact the ISO/IEC 10646-2:2001 had reserved the
last two code points for every plane as "not a character"
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