Lists with elements above INT64_MAX don't work (known bug).  Empty
lists don't work (weird).
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-Id: <1488544368-30622-23-git-send-email-armbru@redhat.com>