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Fixes #50. Not necessarily proposing that you make this change (though not opposed to it), just wanted it written out.
You can see this rendered here.
The second commit includes the change to
difference
discussed here. In the first commit it does roughly the same thing as currently: i.e., iterate both sets and build up a set which contains things in the first set which are not in the second.(The approach in the first commit corresponds roughly to "take everything in A, and remove from it everything in B", whereas the approach in the second commit corresponds roughly to "take everything in A which is not also in B".)