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@Jlookup, I really like your observation. If the tree is full, half the function calls have no effect -- so up to 50% fewer function calls if they are replaced, as in your code, with preemptive short-circuits.
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Tree: Postorder Traversal
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@Jlookup, I really like your observation. If the tree is full, half the function calls have no effect -- so up to 50% fewer function calls if they are replaced, as in your code, with preemptive short-circuits.