Comment by LorenPechtel

Second this. My work occasionally deals with Gcode files. The coding is simple, knowing what to do (or not to do!) is harder. My first foray into the world of Gcode I named "Smokey" because it was a quick fix for another program generating bad Gcode that quite literally caused smoking on the work surface and could have lead to a fire had the operator not been paying attention.

And note that while Gcode is consistent it's meaning isn't always--is Z positive going into the work surface or going away from the work surface?