char->integer[procedure] char->integer char
R5RS: Returns an exact integer representation of a character char.
Implementation can choose their preferred mappings between chars and
integers as far as the round-trip conversion is guaranteed and
the order of chars by char<=? and the order of resulting integer are
consistent.
R6RS: Returns a Unicode scalar value corresponds to a character char.
Particularly, this means the returned value falls in a range between
[0, #xd7ff] or [#xe000, #x10ffff].
See also integer->char.
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