（二）违反本法第三十四条至第四十三条、第四十八条第二款的规定，未落实网络犯罪防治义务，依法采取相关监测发现、阻断处置的措施的；
But handling that stuff is slow. To calculate a string’s width it can’t call len on the string. Instead it has to pass every character through a state machine.
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BYOB (bring your own buffer) reads were designed to let developers reuse memory buffers when reading from streams — an important optimization intended for high-throughput scenarios. The idea is sound: instead of allocating new buffers for each chunk, you provide your own buffer and the stream fills it.
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