IPAddr#in_addr

# File tmp/rubies/ruby-3.1.3/lib/ipaddr.rb, line 645
def in_addr(addr)
  case addr
  when Array
    octets = addr
  else
    m = RE_IPV4ADDRLIKE.match(addr) or return nil
    octets = m.captures
  end
  octets.inject(0) { |i, s|
    (n = s.to_i) < 256 or raise InvalidAddressError, "invalid address: #{@addr}"
    s.match(/\A0./) and raise InvalidAddressError, "zero-filled number in IPv4 address is ambiguous: #{@addr}"
    i << 8 | n
  }
end