Sigh, I see your point. One of those ugly issues where the standard allows
a whole range of values but in reality people only ever use one specific
value. But you don't want to hard code something because of the standard.
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unlike ipv6, ::1/128, we may use any address in the ipv4 loopback address
block 127.0.0.0/8.
https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
perhaps it might be better to keep the standard library away from the
folklore like "127.0.0.1 is my address,
