You probably shouldn't call it a "capability system" if you don't mean ocaps, because despite your best intentions, many people who are familiar with ocap systems will assume you are engaged in some sort of fraud.
replyIt literally is a capability system it just isn’t OCAP because it’s a purely functional language and there are no objects. You declare capabilities you need and grant them where they’re allowed. It differs in happening at compile time only and not being threaded through every method which I think is ergonomically awful.
replyIt’s heavily inspired by Eiffel and Pony. It is also coincidentally a lot like Bluefin for Haskell[1], and in that spirit I use them beyond security. For example behavioral promises like no_alloc and no_panic.
I’ve shown to some compiler researchers who understood it to be a capability system. In your mind what makes it not a capability system?
[1] https://h2.jaguarpaw.co.uk/posts/bluefin-capability-system/