I also don't agree that missing source format is a problem.
The semantics are well defined.
There are difficulties with 3.0 native (for example, that it forbids
non-native versions) so 1.0 must continue to be used so that it
continues to exist.
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
file-contains-trailing-whitespace debian/changelog *
unknown-runtime-tests-restriction x-dgit-*
file-contains-trailing-whitespace debian/changelog *
unknown-runtime-tests-restriction x-dgit-*
+missing-debian-source-format
+older-source-format 1.0