Comment 1 for bug 1611855

The SRU to trusty introduces a packaging change, to change debian/compat from 7 to 9. This is a deceptively small change; while we definitely want to be using debhelper level 9 or better everywhere in the devel series, this is not normally a change we would accept in an SRU and is not covered by the JujuUpdates upstream release exception (it's packaging, not upstream).

What analysis has been done of the differences (if any) introduced in the resulting binaries packages as a result of this change?