Crossed() is a byond builtin which is called automatically when two movable atoms overlap (as a side effect of Move(), but not when loc or x/y/z is changed). Previously, turf/Entered() iterated through all objects in the turf in order to tell them an object had entered; with this change, HasEntered() becomes redundant and can be eliminated.
This may reduce lag when a large number of objects are moving in a small space (singularity, mining conveyors, etc) but should cause no changes to functionality at all.
-Hot air is less lethal
-Fire is more lethal
-Catch on fire when entering a hotspot but fire_stacks given dropped to 0.5 each
-You now light up your environment while on fire
