Differences between version #3922 and #8365

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< Removes the first element and returns it.  If ''block'' is true and the deque is empty, the function blocks until a function is added.  If ''block'' is false and the deque is empty, the function returns ''null'' immediately.
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> Removes the first element and returns it.  If ''block'' is true and the deque is empty, the function blocks until an element is added.  If ''block'' is false and the deque is empty, the function returns ''null'' immediately.