This is slightly off-topic, since my problem is about rearranging a linear order and not necessarily connected to trees.
Of course I knew this article already, it deals with structure which can be described as hashes of hashes.
But my f_sort expands the model to also include arrays.
Please note that the described downsides are rather obsolete for trees with a maximal depth, as long as you can use Self Joins and Updatable Views.
And even a dynamic depth could be handled by redefining the view.
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