I thought so also, but afaict, it ensures the elements of each individual list are unique, i.e. not
[:a, :a]
Rather than not
[[:a, :b], [:a, :b]]
I thought so also, but afaict, it ensures the elements of each individual list are unique, i.e. not
[:a, :a]
Rather than not
[[:a, :b], [:a, :b]]