anchor.diff:  			final_arrangement[current_identifier] = list(current)
   
   		else
  +			//Sanity check.
  +			if(!islist(final_arrangement[current_identifier]))
  +				final_arrangement[current_identifier] = list()
   			final_arrangement[current_identifier] += current
   
   	//lazy but fast
  
positive.code: 
  	//Generate the gas_mixture for use in txhis zone by using the average of the gases
  	//defined at startup.
  	air = new
  	air.group_multiplier = contents.len
  	for(var/turf/simulated/T in contents)
  		if(!T.air)
  
negative.code: 		return
  
  	if(!unsim_air_needs_update && air_unsim) //if air_unsim doesn't exist, we need to create it even if we don't need an update.
  		return
  
  	//Tempfix.
  	if(!air)
  		return
  
  	unsim_air_needs_update = 0
  