_svcj_ipaddrs option for FreeBSD 15 service jails: https://github.com/freebsd/freebsd-src/pull/1621
it works like this:
inetd_enable=YES
inetd_svcj=YES
inetd_svcj_options="net_basic"
inetd_svcj_ipaddrs="::1 127.0.0.1 2001:db8::1"
a few obvious use-cases:
* fix services that don't let you configure bind address
* fix services that can only bind to a single IP address, meaning they can't bind to both an IPv4 and IPv6 address
* easily set outgoing IP address on a per-service basis