advice to referees 'book'?

socal lurker said: ↑

Since the only part of the goal line that matters is the outside edge, it seems pretty obvious to me that the back of the posts should align with the back of the line, just as the ATR opined. (This also means that the AR has them as a tool to know when the ball has crossed the whole line on close calls.)
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Always made sense to me. But people will vigorously debate about it.