// No BYOB request - allocate and enqueue a chunk
// 步骤1：计算每辆车的到达时间（精确浮点数，禁止取整！）
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lowerdir is the read-only directory (composefs) containing file metadata, and datadir is the directory containing the data (erofs).
Transform backpressure gaps
def to_dict(self) - Dict[str, Any]: