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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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As I grew older, I would discover that it was not, in fact, a photograph of my dad but of a man called Elvis Presley. Apparently he was very famous. My grandma had been a lifelong fan. My parents laughed – an adorable mistake – but I felt a hot pulse of humiliation.