[plt-scheme] small numeric changes in v3.99.0.16

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Fri Feb 29 14:55:01 EST 2008

To bring PLT Scheme better in line with R6RS, and because they seem
like good ideas:

 * Complex numbers with inexact-zero imaginary parts are no longer
   considered real (or rational or integers).

 * The numbers +inf.0, -inf.0, and +nan.0 are no longer considered
   rational (or integers).


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