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Test constant: A 6-bit identifier from the microcode that tells the PLA what kind of check to perform.
，这一点在旺商聊官方下载中也有详细论述
这种方法实现简单，但需要在每个 iOS 调用点手动处理类型转换。
Developers using the streams API are expected to remember to use options like highWaterMark when creating their sources, transforms, and writable destinations but often they either forget or simply choose to ignore it.