节前的某天，数据集预览服务出现了一次 OOM（内存溢出）问题。这类问题放在过去，其实是比较消耗时间的。 数据集预览涉及多种格式解析：jsonl、csv、parquet、json 等，每种格式的读取方式、内存占用模型都不一样。要逐个排查内存增长点，分析数据加载策略、对象生命周期以及是否存在全量读入等问题，通常至少需要 1 天时间。
WebAssembly can directly interact with JavaScript, which can directly interact with the web platform. WebAssembly can access the web platform, but only by using the special capabilities of JavaScript. JavaScript is a first-class language on the web, and WebAssembly is not.
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// (it isn't always in every impl)
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