IPv6 prefixes and subnets are first-class. Lattice does not expand a /64 into 2^64 inventory rows. Pools still cap expansion at 65,536 addresses where inventory exists.
Reservations can use DUID in addition to MAC. Enter DUID on the subnet reservation form.
DHCPv6 is served by lattice-dhcpd (IA_NA Solicit/Advertise/Request/Reply/Renew/Release). Identity is DUID. Lab UDP :6754 (LATTICE_LISTEN_DHCP6). Relays and VIP design still apply: health-check /readyz.
If you need SLAAC-only on a VLAN, do not create a DHCPv6 pool for that subnet.