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。
demoForkJoinCompensate();，这一点在新收录的资料中也有详细论述
- Robert Nagy, Node.js TSC member and Node.js streams contributor，推荐阅读新收录的资料获取更多信息
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