I noticed a few methods in STK Util could benefit by using parameterized lists.

Upon looking deeper, I noticed a number of places that for / while loops could be replaced with "for each loops" and make the code easier to read and simpler to maintain.

In also removed instances of unnecessary unboxing.

All three of these changes are implemented in separate patches, and I also have one that has all the changes combined into one patch (whichever you find easiest to work with)

(tested this and all tests apply fine after these changes are applied)