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BetterReader.read_with_cancel() returns both the read promise, and a function that can be used to cancel the read. A cancelled read is placed back into the BetterReader's chunk buffer, to be consumed by the next user that requests a read. This is used by Coupler so that when the coupler is closed, its pending read() call does not consume the next batch of input. This fixes the problem we were having with child applications consuming one chunk of stdin after they are closed, meaning the first key you press after an app exits would disappear. Co-authored-by: KernelDeimos <eric.alex.dube@gmail.com>