jashkenas/underscore — pull request #1247 by sjpsega (2013-08-07 03:07:29+00:00)
Title: sortBy function improve

I use underscore in [Adobe PhotoShop js](http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/photoshop/pdfs/photoshop_cs5_javascript_ref.pdf) writing;It's js environment is special,it's Array sort function is special,It may happen left and right is equal.