Why are IPv6 DNS lookups done even when IPv6 is disabled?

Issue

• Applications like ssh and telnet use the getaddrinfo() function with AF_UNSPEC and this function invokes both AAAA (IPv6) and A (IPv4) lookups one after the other. This can delay the connection time when DNS servers block or don't handle IPV6 correctly.
• How do I prevent IPv6 DNS queries?
• getaddrinfo() takes a long time to resolve hostnames
• DNS lookups slow in Java due to poor response to IPv6 AAAA records
• How can I change the getaddrinfo(AF_UNSPEC) system call behaviour in Java, to only look up IPv4 A records when a DNS request is made?
• Java application hangs on DNS resolution lookup with backtrace like:

"http-8080-1" daemon prio=10 tid=0x00007fba60008800 nid=0x3d5d runnable [0x00007fba96b3a000]
   java.lang.Thread.State: RUNNABLE
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:902)
    at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1281)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1232)
    at java.net.InetAddress.getAllByName(InetAddress.java:1163)
    at java.net.InetAddress.getAllByName(InetAddress.java:1099)
    at java.net.InetAddress.getByName(InetAddress.java:1049)