This year there were more than 30,000 applicants for 10,000 jobs at this stage, although some will have been doctors from abroad.
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
，这一点在heLLoword翻译官方下载中也有详细论述
Home Office denies ‘absurd’ criticism over rule change that may leave dual nationals stranded
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