I should be able to strip duplicates from a List

(User Story, Investigate , Priority: High, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284oe not found, )

Functions

Summary: Not sure what the best approach is -- might be an explicit function to so this, might be a _toSet function.

Original report from Eric was:

I briefly tried an approach of [[_concat(Errata, FAQ Entry) -> _instances -> References Items -> _sort -> _bulleted]] before realizing that _tagsForProperty existed. That failed in that it includes duplicates for tags used more than once. Is there a way to strip duplicates from a list?