Programmer 
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Factorio dev when a piece of code works "at the first try" After about 2 days of looking over the code, re- arranging, and writing comments explaining parts to myself, I had a plan for how I was going to make it work. The final changes to make everything function correctly took about 1 hour to write, and worked correctlv the first trv. That’s not supposed to happen and left me with doubts. Several extra tests later, and asking Boskid to try to break it, it was confirmed to be correct.