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Scheme number notation

Oops!  I have to take back my complaint that R3RS underspecifies the
interrelationships among values returned by CHAR->INTEGER for numeric
characters.  JAR pointed out to me that you can just compute a table in
which to look up the values (indexed by the CHAR->INTEGER result).  It
wastes some space, but so what.  Now my reader is completely (?) portable
under R3RS.