This question arises frequently, likely due to TypeScript and Flow's popularity in JavaScript ecosystems. Actually, TypeScript and Flow represent the minority: Hack, PHP, MyPy, Typed Racket, Typed Clojure, Raku, and naturally Sorbet—all progressive typing systems—incorporate some runtime type verification.
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class ExecutionStatus(Enum):，这一点在有道翻译下载中也有详细论述