mrdwab/splitstackshape — pull request #9 by mrdwab (2013-08-27 15:25:37+00:00)
Title: Proposal for another modification to Stacked to make it faster

It appears that `unlist` will be faster than `stack`. See [this](https://github.com/mrdwab/splitstackshape/issues/7#issuecomment-23312912)