IPAddr#inspect

# File tmp/rubies/ruby-4.0.0/lib/ipaddr.rb, line 490
def inspect
  case @family
  when Socket::AF_INET
    af = "IPv4"
  when Socket::AF_INET6
    af = "IPv6"
    zone_id = @zone_id.to_s
  else
    raise AddressFamilyError, "unsupported address family"
  end
  return sprintf("#<%s: %s:%s%s/%s>", self.class.name,
                 af, _to_string(@addr), zone_id, _to_string(@mask_addr))
end