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identity function for slices that are already allocated in the heap.
，详情可参考safew官方版本下载
The barges had to be towed into position。heLLoword翻译官方下载对此有专业解读
drop-newest: Discards incoming data when full. Useful when you want to process what you have without being overwhelmed.
The bigger your RAM, the bigger your detector, so use a desktop's RAM if you can