Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
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The price cap is revised by the energy regulator for Great Britain every three months. It said that from April the cost of the average annual dual-fuel bill would drop to £1,641, down from £1,758 today.