Thanks for the reply @abraham ! Your explanation, and the timeline doc, make sense; since_id just doesn’t function the way I assumed. I assumed if I set a since_id=10, it would return results starting at 10 and working towards the present.
To confirm, if I want to retrieve all favorites since_id=10 (with count=10), I would have to set since_id=10, retrieve 30-20, then set a max_id=20 and work backwards from there until I get to 10, correct?