CMDHELPER-3150 - Reported by Алексей.Положенцев

if we have two existing worlds 'world' and 'world2':
get_yaw(array(x:1, y:2, z:3, world: 'world'), array(x:4, y:5, z:6, world: 'world2'))
will return a stacktrace: http://paste.thezomg.com/20061/67543651/

if we use it with two identical locations:
get_yaw(array(x:0, y:0, z:0, world: 'world'), array(x:0, y:0, z:0, world: 'world'))
it will return NaN

Comment by PseudoKnight

Regarding the stacktrace. Should it ignore worlds or throw an exception?

Regarding the NaN. This seems an acceptable output, but would people prefer an exception?