Actually Ubuntu can place a workaround by pre-configuring gai.conf.
Easy fix will be to create separate label for IPv4 loopback address
/etc/gai.conf
label ::ffff:0f00:1/96 8

background:
ANY4->ANY4 connect yields to 127.0.0.1 -> 0.0.0.0
ANY6->ANY6 connect results ::1 -> ::
BUT
both 127.0.0.1 and 0.0.0.0 are label 4
while ::1 and :: are labels 0 and 3
adding specific label for v4-lo equals sorting by removing 'equal lable' case 
match.

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https://bugs.launchpad.net/bugs/673708

Title:
  getaddrinfo and AI_PASSIVE is broken for net.ipv6.bindv6only=0

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