The purpose of the harpoon.Util.Collections
package is to collect
together all of our Collections-related classes.
One key portion of the Collections package are the various collection factories, which are designed to allow code to parameterize which type of Collection it will use internally.
Collection-related classes elsewhere in FLEX will eventually be cleaned up, organized, and migrated into this package so that all Collections-related code is kept together.
This package has been spun off into its own library, JUtil, if you want to use it in other work.