Clone refactoring for memory #118
Description
NodeRef::clone_as_tree_with method can be added to NodeRef::clone_as_tree
Further default Clone implementation can make use of NodeRef::clone_as_tree_with to reduce allocation.
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NodeRef::clone_as_tree_with method can be added to NodeRef::clone_as_tree
Further default Clone implementation can make use of NodeRef::clone_as_tree_with to reduce allocation.