Duck typing is really helpful for cases where you want to expose a Rust trait to JS: as long as your Rust-exported type implements the interface, you can accept your Rust-exported type a JS-imported type, while retaining the ability to replace it with JS-imported types. A concrete example is if you’re exporting a storage interface, you likely have a default Rust implementation, but want extensibility if downstream devs want to give it an IndexedDB or S3 backend.
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气象专家指出，该国中部地区积雪完全消融的平均日期为4月12日。她表示：“因此在此之前本应保持积雪状态，降雪天气甚至可能持续到本月最后几天。”