Tool that finds unnecessarily exported objects and helps unexport them.
Options:
-list: Shows a list of objects that can be unexported
-uses: Shows a list of objects that are used in other packages and lists those packages
-n: Shows filename and line number for listed objects
-s: Use simple name instead of full object type string
-e string: A list of names, separated by ',', that will not be unexported
-i: Interactive mode