only in cases where the guess is small:
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.
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圖像來源，New York State Division of Criminal Justice Services
// (it isn't always in every impl)