I've been avoiding curbs. I remember back when I was learning to ride last year that I had difficulty when there was a line or crack in the pavement. I would fixate on that line or crack and often unintentionally dismount going over the crack. Same with curbs, but of course unlike cracks in the pavement there actually is a bit of a jiggle.
Today I rode over three. I approached them at slow to slow-normal speeds. I went over two with no hands, and one with right hand clutching the nose of the seat. All three were landed just fine, and no crushed nuts.
Now I'm thinking they aren't such a big deal. I should make sure to add in several during each ride just so I get over fixating them. Just like how now I barely notice cracks.