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* util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double ...Matthew Wild2009-04-221-4/+54
* util.set: Rename private items container, optimise set.difference() and add s...Matthew Wild2009-03-231-9/+18
* util.set: Fix to make constructor work, and functions defined correctlyMatthew Wild2009-03-221-8/+14
* util.set: New util libraryMatthew Wild2009-03-221-0/+75