There are times when it feels as though the entirety of British horse racing exists in a state of perma-gloom, bewailing an ageing fanbase, declining attendances and a moribund, factional leadership. It is, so the narrative goes, a sport in slow but irreversible decline, waiting for the inevitable moment in 10 or 20 years’ time when someone finally comes along to turn out the lights.
Emer MoreauBusiness reporter
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const dropOld = Stream.push({ highWaterMark: 2, backpressure: 'drop-oldest' });
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1. 选择步长序列（如: n/2, n/4, ..., 1）