Data flows left to right. Each stage reads input, does its work, writes output. There's no pipe reader to acquire, no controller lock to manage. If a downstream stage is slow, upstream stages naturally slow down as well. Backpressure is implicit in the model, not a separate mechanism to learn (or ignore).
在 iOS 平台上，需要处理 NSData 的转换。这里使用 pinned 内存操作来安全拷贝数据，确保跨平台兼容性。
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The IBM 801, 802, and 803 line of check proofers used what were fundamentally
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