I just posted an overdue update. I used to update the library once or twice a month but it's been just over two months.
The biggest change is to the can_bump() proc. Previously, the default behavior made you only able to bump dense turfs - you'd walk right through mobs. While this may frequently be the desired behavior, it's not consistent with BYOND's default density behavior and caused some confusion. The can_bump proc now behaves more like you might expect.
There are still some exceptions. Non-dense mobs can walk through dense mobs, but they still bump into dense turfs. If they didn't, you'd fall through the floor and off the map - that's probably not what you want to happen. Also, atoms with scaffold = 1 are treated as non-dense. You can walk in front of them or stand on top of them. If you want them to be dense so you can't move over them at all, set density = 1 and scaffold = 0.
I also added a new demo (called v4.2-demo) which shows a new feature for ladders. The mob now has an on_ladder() proc which determines if they're standing over a ladder. This proc is called to check if the mob can climb a ladder. By default it returns 1 if the turf the mob overlaps most is a ladder and 0 otherwise. The demo shows how to change this so you can climb a ladder only if you're completely inside the turf horizontally. The demo also shows how to make the top ladder turf be a scaffold so you can stand on top of it (like ladders in Mega Man).
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