$GENERATE is broken in two respects:

- a range like "a-b" results in RRs generated only from "a" to "b-1".
  The last RR is not generated

- there is a bug in the range checking which ensures that "a" is smaller
  than or equal to "b"

I did a patch which fixes both bugs and submitted the patch to ISC which
confirmed that they applied the fixes. Up to now there is no new version of
bind9 out, so I'll attach the patch to this bugzilla report for inclusion
in the RH RPM. Can be thrown out when the next ISC version is released, but
that is most probably too late for the public beta.