#IETF RFC 9777 was released last month, replacing RFC 3810 for #Multicast Listener Discovery ( #MLD2 ).
Reviewing this, aside from a bunch of textual clarifications and fixes, the only real technical change to speak of was an adjustment to the Multicast Address Listening Interval (MALI).
I've patched #libmld and #librecast with the new timer value and the change will be included in the next release.