Option.ArgVar takes a pointer to a variable that it sets on success. Its
当配置变更（Config 对象引用变化）时，WeakMap 的键失效，缓存自动失效。不需要显式清除——这是 WeakMap 的自动 GC 特性，优雅地解决了缓存失效问题。
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I’m pretty happy with where my career is at now, but for a long time a big guilty displeasure I had was math. I’m a smart guy; I’ve studied the sciences and used to really like physics; I enjoy puzzles and intellectually stimulating exercises; I work in software and artificial intelligence. It seems like someone like me should like math. I’m not even bad at it! But it bores me to death. If I liked math, I think I could have made more money or had more impact in the technical fields I picked for myself. I could have enjoyed biology research and its heavy reliance on statistics. I could have had a lot of fun doing linear algebra and become a star AI researcher or something. But no, I’m stuck working in software, constantly hoping that I won’t ever need to multiply matrices or interpret a p-value.
How photographer captured six planets in 'parade'
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