“先吃饱肚子再吃好”，蕴含着循序渐进的基本道理。
No custom ReadableStream class with hidden internal state. A readable stream is just an AsyncIterable. You consume it with for await...of. No readers to acquire, no locks to manage.
，更多细节参见同城约会
for (int32_t i = 0; i < arr.size; i++) {
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