Make sure the first segment is not empty or it's not complete (is current) #40
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In an edge case, on load, we found that it is possible to have the first segment being empty (size()==0) and also complete (reached q.config.ItemsPerSegment limit).
In such queue, the Peek() and Deque() return error 'empty', but that is not correct as the queue has another segment with available objects.