What Spaced Repetition Scheduler does RemNote use?

What Spaced Repetition Scheduler does RemNote use?

RemNote currently offers two spaced-repetition schedulers schedulers:

When customizing a scheduler, you can visualize example schedules directly within RemNote. For example, here are examples for the default scheduler:

How is the relearning phase (pressing again on a card with a lot of ease) handled by the default scheduler? Assuming it exists in it at all, of course.