// Fill with sequential bytes (our "data source")
第三条 增值税法第三条所称单位，包括企业、行政机关、事业单位、军事单位、社会组织及其他单位。
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The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.