Fix buglet noticed by JimB (that of not being handling the most-negative number).
Fix buglet noticed by JimB (that of not being handling the
most-negative number).

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion