Furnaces can't have recipes with more than one solid ingredient. Fluids don't count towards that restriction.

Oh, wow. I did not know that. Time to change all of my machines to furnaces....

Hey, I am starting with my own overhaul mod and was wondering... how does the barrelling pump with auto-barrelling work script-wise? I mean, it's not possible to have a furnace with two inputs. Unfortunately, I couldn't really find much in the files and the auto-barreling mod for 0.15 is just baffli...