#\u[reader syntax] #\uXXXX
SISC, Gauche: denotes a character whose
codepoint in Unicode is XXXX, represented in
hexadecimal integer.
SISC covers UCS2. Gauche covers more.
Related: Bigloo has separated type for UCS2 character.
See ucs2?.
R6RS defines #\xXXXX for unicode character U+XXXX.
(The number of digits doesn't need to be 4). See #\x.
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