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Problem: The previous fix in #34314 relies on copying the tree in `tree_root` to ensure the `TSNode`'s tree cannot be mutated. But that causes the problem where two calls to `tree_root` return nodes from different copies of a tree, which do not compare as equal. This has broken at least one plugin. Solution: Make all `TSTree`s on the Lua side always immutable, avoiding the need to copy the tree in `tree_root`, and make the only mutation point, `tree_edit`, copy the tree instead.