UTF-16
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... indicates continuation.
UTF-9 does not use surrogates; consequently a UTF-16 value must be
transformed into the UCS-4 equivalent, and U+D800 - U+DBFF are never
...
... bit value.
UTF-18 does not use surrogates; consequently a UTF-16 value must be
transformed into the UCS-4 equivalent, and U+D800 - U+DBFF are never
...
... codepoints;
that is, codepoints used for UTF-16 surrogates or codepoints with
values exceeding 0x10ffff for [UNICODE ...