Perhaps the reason for this was that systems programmers
圖像加註文字，張先生包車穿過沙漠抵達利雅德，看到飛機升降時心情激動。搭上第一班機
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What you learn after dealing with time zones, is that what you do is you put away your code, you don’t try and write anything to deal with this. You look at the people who have been there before you. You look at the first people, the people who have dealt with this before, the people who have built the spaghetti code, and you thank them very much for making it open source, and you give them credit, and you take what they have made and you put it in your program, and you never ever look at it again. Because that way lies madness.
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南方周末：在这些关键时间点，都发生了什么具体的事情？，这一点在新收录的资料中也有详细论述
There are trivial cases, like a screw driver of varying length or the width of a table. Traditional geometric constraints can suffice here. But what if we want a key based of a list of numbers describing the heights of a lock's pins? Now we need programming.