Bug? IPv6 Negative Netmask

[hnyman]

See also

[Solved] Firewall dest ipv6 xxx.xxx.xxx/-64 not possible?

Hi I try to set up some traffic rules for IPv6. As I don't have a static prefix I thought of entering an address with negative prefix like ::xxx:xxx:xxx/-64. I think I ahve seen something like this, but LuCi doesn't accept it. Any idea how to solve this?

Based on that, it might need to start with ::