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sync: Remove readiness assertion in `watch::Receiver::changed() (#2839)
*In `watch::Receiver::changed` `Notified` was polled for the first time to ensure the waiter is registered while assuming that the first poll will always return `Pending`. It is the case however that another instance of `Notified` is dropped without receiving its notification, this "orphaned" notification can be used to satisfy another waiter without even registering it. This commit accounts for that scenario.
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