[systemd-devel] nss-myhostname: why don't loopback interfaces appear?

[Daurnimator]

I was playing around with nss, and found that my loopback interface ip
doesn't appear from nss-myhostname.
Rather, my other ones do.
Furthermore, unless I request IPv4, link-local IPv6 addresses are
returned. Is this expected?

$ uname -n
daurn-m3800

$ getent hosts daurn-m3800
fe80::aed1:b8ff:fec0:d113 daurn-m3800
fe80::9eeb:e8ff:fe1b:f42d daurn-m3800

$ getent ahostsv4 daurn-m3800
192.168.2.229   STREAM daurn-m3800
192.168.2.229   DGRAM
192.168.2.229   RAW
192.168.2.21    STREAM
192.168.2.21    DGRAM
192.168.2.21    RAW

$ getent ahostsv6 daurn-m3800
fe80::aed1:b8ff:fec0:d113 STREAM daurn-m3800
fe80::aed1:b8ff:fec0:d113 DGRAM
fe80::aed1:b8ff:fec0:d113 RAW
fe80::9eeb:e8ff:fe1b:f42d STREAM
fe80::9eeb:e8ff:fe1b:f42d DGRAM
fe80::9eeb:e8ff:fe1b:f42d RAW


# For reference, my current network setup:
$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: wlp6s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
state UP group default qlen 1000
    link/ether ac:d1:b8:c0:d1:13 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.229/24 brd 192.168.2.255 scope global dynamic wlp6s0
       valid_lft 64025sec preferred_lft 64025sec
    inet6 fe80::aed1:b8ff:fec0:d113/64 scope link
       valid_lft forever preferred_lft forever
5: enp0s20u2u4u4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
fq_codel state UP group default qlen 1000
    link/ether 9c:eb:e8:1b:f4:2d brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.21/24 brd 192.168.2.255 scope global dynamic enp0s20u2u4u4
       valid_lft 64025sec preferred_lft 64025sec
    inet6 fe80::9eeb:e8ff:fe1b:f42d/64 scope link
       valid_lft forever preferred_lft forever