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A gem for ActiveRecord that implements nested sets using real numbers rather than integers. This means there is always space available for new entries into a tree, unlike with integers.
The proper topological name is a "Hausdorff Space", the pun being that any two points can be housed off from each other by being surrounded by two disjoint sets of neighbouring points.
Hence I'm calling it acts_as_hausdorff_space rather than acts_as_real_nested_set