Move removeIndex's result instead of copying #1516
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Currently removeIndex copies the removed value into removed and then destructs the original, which can cause significant performance overhead.
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Currently removeIndex copies the removed value into removed and then destructs the original, which can cause significant performance costs when removing a large tree by index. This change causes removeIndex to std::move the removed value into removed instead, avoiding this copy and destruction overhead. removeMember already moves its result in this way.