Its return value is a queue that yields tuples of the old and new
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During last year's MWC, Nothing launched two smartphones, the Nothing 3a and Nothing 3a Pro. Both were slick-looking, fairly affordable mid-rangers with big displays, big batteries, and a couple of Nothing-specific software features.
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Condition is designed to check the current value when a consumer wakes up. That's fine when state only moves forward, but it falls apart when transitions are fast. When the setter changes state, it calls notify_all(), which schedules wakeups for every waiting consumer. But in a single-threaded event loop, no consumer actually runs until the current coroutine yields. If the value changes again before that happens, consumers wake up and re-evaluate their predicate against the current value, not the value that triggered the notification. The predicate fails and the consumer goes back to sleep, potentially forever.