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。
Whether it would improve the syntax is more up for debate; we think
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FontPairsHigh (= 0.7)% highPhosphate775267.5%Copperplate1036967.0%Chalkboard201260.0%Verdana643656.3%PT Serif Caption492755.1%Big Caslon261453.8%DIN Alternate784152.6%