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Keep worker execution capacity available for queue items that arrive while another task is still running.
mapConcurrent()retains its existingfillSlots()and result-processing flow. Live queues may optionally expose a one-shot, non-consumingonNextItemAvailable()callback. While mapper capacity is available,mapConcurrent()races that callback against active task completion and refills its existing slots when notified.Queue lifecycle
Stopping
mapConcurrent()only unsubscribes its callback. It does not read, close, flush, or discard queue contents. Existing queueclose()behavior is unchanged, and sources without the optional callback retain the previous polling behavior.Tests cover live arrivals, early consumer exit with a reusable source, and preservation of pending batches.