Even less IPv6 support than docker. With docker you can at least get it to work somehow, even if it is totally different from IPv4, weirdly. Podman just has no IPv6 support to speak of.
Well, from that issue from 2020-12-24: "--ipv6 has not landed yet", so you cannot assign static external v6 adresses to a container. No activity on that bug since. There is tons of stuff in docker that works automatically, where in podman it is like "Please be aware you have to configure ip6tables (or whatever your OS firewall is) for forwarding.". Yeah, well, if i have to do everything by hand or program a ton of scripts around it, it is quite useless, isn't it?
IPv6 support is always like this: half-baked at best, someone got it to work somehow, developers declare it done since it worked for someone. Then crickets...
IPv6 support isn't done until you can replace IPv4 with it, with no changes to your config except addresses. Even docker isn't there yet. And podman's is still in a larval state.