229-4ubuntu19 # systemd-resolve www.gnu.org.. www.gnu.org..: 208.118.235.148 2001:4830:134:3::a (www.gnu.org)
-- Information acquired via protocol DNS in 1.8ms. -- Data is authenticated: no
Which is BAD.
229-4ubuntu20 # systemd-resolve www.gnu.org.. www.gnu.org..: resolve call failed: Invalid hostname 'www.gnu.org..'
Which is GOOD and standards compliant.
229-4ubuntu19
2001:4830: 134:3:: a
(www.gnu. org)
# systemd-resolve www.gnu.org..
www.gnu.org..: 208.118.235.148
-- Information acquired via protocol DNS in 1.8ms.
-- Data is authenticated: no
Which is BAD.
229-4ubuntu20
# systemd-resolve www.gnu.org..
www.gnu.org..: resolve call failed: Invalid hostname 'www.gnu.org..'
Which is GOOD and standards compliant.