For 0.10, I'm considering:
- Ceiling will always be open. (In 0.9, ceiling infinitely extends the top row's physics.)
- Bottom will always be open, to fix github #311: Digger may build on air near edge of map (https://github.com/SimonN/LixD/issues/311). (In 0.9, bottom infinitely extends the bottom row's physics.)
- Left void and right void infinitely extend the physics of their edge column. Walkers will walk out of the map and die. (Same as in 0.9.)
From OP:
Left gif is 0.9, right gif is what will likely be 0.10. I accept the odd-looking ascending of the climber (right gif) as a downside of the open ceiling in 0.10.
Both climbers still die here. The 0.10 climber will die slightly earlier.
(http://www.lixgame.com/etc/climber-climbs-into-void.gif) (http://www.lixgame.com/etc/climber-ascends-into-void.gif)
-- Simon