The maximum number of entities is inconsistent

[akhilman]

In Entities::alloc we are trying to convert the total number of entities to u32, so the maximum number of entities is u32::MAX. In Entities::alloc_many we are directly comparing number to u32::MAX. But in Entities::reserve_entities, Entities::alloc_at, Entities::reserve and many other places in code iszie is used, so on a 32-bit system these functions expect the maximum number to be i32::MAX , which is half of u32::MAX. Entities::free_cursor is also AtomicIsize.

Is my observation correct? Is this intentional behaviour? Should iszie be replaced by i64?

[Ralith]

Unfortunately AtomicI64 sacrifices portability; see #204. It's possible that different interfaces will behave differently when dealing with numbers of entities above i32::MAX. I'd be happy to accept PRs to mitigate this or otherwise improve consistency, but I'm not convinced that supporting more than 2 billion entities is important.

[akhilman]

Ok. Then the maximum number of entities should be limited by i32::MAX.