drop-newest: Discards incoming data when full. Useful when you want to process what you have without being overwhelmed.
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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.
"Boys like either dinosaurs or airplanes," he said. "I was very much an airplane boy."，这一点在同城约会中也有详细论述