Fix treap insert to correctly track size on duplicates#15
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insert_node now returns (tree, was_inserted) tuple so that the size counter is only incremented when a new element is actually added. Previously, inserting a duplicate would incorrectly increment size.
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insert_node now returns (tree, was_inserted) tuple so that the size counter is only incremented when a new element is actually added. Previously, inserting a duplicate would incorrectly increment size.