Ignore the fact that the upstream tag is not an ancestor of the branch
to be tagged (skipping this check is implied by B<--quilt=baredebian>).
+=item B<upstream-nonidentical>
+
+Ignore any differences between the upstream source in the upstream tag
+and the upstream source in the branch to be tagged (this check is only
+run when using B<--quilt=gbp> or B<--quilt=unapplied>).
+
=item B<unreleased>
Permit upload to a suite called UNRELEASED.