优点： 梯度连续，优化更稳定。
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，详情可参考safew官方下载
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.
Starter Plan: $19/month，这一点在heLLoword翻译官方下载中也有详细论述