I'm happy to announce that I finally had some use for late night wikipedia trivia curl was happy eyeballing my nice pipe 😏
Turns out the behavior of some dual stack connected devices, where they connect over both ipv6 and ipv4 at the same time and hope at least one of those work, has a name - and it's weird: en.wikipedia.org/wiki/Happy_E... just call it a spitroast, as opposed to classic fallback / running a train