RoomPosition.lookFor(LOOK_TERRAIN) returns a string instead of an array
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 RoomPosition.lookFor() is supposed to return an array, however in the specific case of using it with LOOK_TERRAIN, it returns a single string containing the type of the terrain. All other LOOK_* types seem to properly return an array. Room.lookForAt(LOOK_TERRAIN, ...) properly returns an array with a single terrain type as a string inside it, as expected. 
 
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 I'd suggest you use http://support.screeps.com/hc/en-us/articles/203079191-Map#getTerrainAt In the meantime until this is fixed. Could you try that out? 
 
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 @dissi actually I'm just reporting an issue that someone mentioned a few days ago on Slack, and we already suggested him to do that, but thanks  
 
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 Thanks for reporting, fixed. 
 
