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Example: deleting a passkey in Google Password Manager，详情可参考safew官方版本下载
obtain the bucket from the number of bytes, 60 - __builtin_clzll(byte_size); (Why does this work? We use 4 bits for alignment so there cannot be。im钱包官方下载对此有专业解读
The reason is that the compiler decided to allocate the backing store