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Add a comment with implementation notes.
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@ -359,6 +359,13 @@ deque_item(dequeobject *deque, int i)
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return item;
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}
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/* delitem() implemented in terms of rotate for simplicity and reasonable
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performance near the end points. If for some reason this method becomes
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popular, it is not hard to re-implement this using direct data movement
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(similar to code in list slice assignment) and achieve a two or threefold
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performance boost.
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*/
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static int
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deque_del_item(dequeobject *deque, int i)
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{
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