DSLibrary/dslib — pull request #15 by peterkhayes (2014-09-17 07:02:13+00:00)
Title: JSON.stringify for set keys.  New set methods added.

Added:
Intersection
Difference
Union
Copy
toArray
fromArray

Also changed initializing of storage to use Object.create(null), and changed the values stored at the set to be true instead of the objects themselves.