"stable" means HasNext/HasPrevious didn't incur a sizable perf hit with respect to the total time of the request.
Example1:
Id ASC:
stable 100ms in all cases
Example2: (close to million <--> close to 0)
with index on Created:
Created DESC:
- without access predicate: stable 100ms
- with access predicate: stable 100ms
Created DESC, Id ASC: - without access predicate: next: 100/400, prev: 400/700 <--> next: 400 stable, prev: stable 100ms
- with access predicate: next: 100/500, prev: 500/900 <--> next: 400 stable, prev: stable 100ms