documentcloud/underscore — pull request #796 by braddunbar (2012-09-24 16:17:11+00:00)
Title: _.sortedIndex takes a string as an iterator.

For a possible use case, check out my comments on documentcloud/backbone#1667 ([this one](https://github.com/documentcloud/backbone/pull/1667#issuecomment-8822141) in particular).