IPAddr#to_range

# File tmp/rubies/ruby-3.2.0/lib/ipaddr.rb, line 402
def to_range
  begin_addr = (@addr & @mask_addr)

  case @family
  when Socket::AF_INET
    end_addr = (@addr | (IN4MASK ^ @mask_addr))
  when Socket::AF_INET6
    end_addr = (@addr | (IN6MASK ^ @mask_addr))
  else
    raise AddressFamilyError, "unsupported address family"
  end

  self.class.new(begin_addr, @family)..self.class.new(end_addr, @family)
end