https://mailarchive.ietf.org/arch/msg/dhcwg/icOKdSHvTGpamw9oib-NYs6coY8/
https://mailarchive.ietf.org/arch/msg/dhcwg/Y-NN2LuzicM0KafU_YBZBMuN9cA/
https://mailarchive.ietf.org/arch/msg/dhcwg/-2Clwa5sjEAexXAaO8D0pk1EpWs/
https://mailarchive.ietf.org/arch/msg/dhcwg/uLxv7n3i1U4eLYdMz_8_u_o-HRo/
https://mailarchive.ietf.org/arch/msg/dhcwg/sRjVKgpl9-TA_zkKiGBe1NawbiA/