I’ve been part of similarly generalized ACL systems and it’s pretty straightforward and very similar to Zanzibar. Though we didn’t need n ACLs and could assume

I’ve been part of similarly generalized ACL systems and it’s pretty straightforward and very similar to Zanzibar. Though we didn’t need n ACLs and could assume the list wasn’t too long, so we didn’t need a tree. If we did, then we’d have ended up in a similar place as Zanzibar I believe, there are a limited number of ways to solve that problem.