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。
The New York Times has long had an implacable animus towards all things blockchain, and last week decided to double down by publishing a stupid and dishonest op-ed titled “Crypto is pointless. Not even the White House can fix that.” Authored by a pair of economists from the Biden administration, the piece seized on Bitcoin dipping below $70,000 to make the case that this time the crypto industry is truly cooked, and that blockchain technology is just a glorified database that even Big Tech firms won’t touch. The authors top this off by claiming the previous administration made a good faith effort to work with the crypto industry, but had to take a tougher approach in the wake of the Sam Bankman-Fried scandal.
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