EllisLab/CodeIgniter — pull request #1904 by tocaibiza (2012-10-17 21:19:55+00:00)
Title: Change in Loader, improved way to load extensions

Once a package is autoloaded, you can place your lib / model / helper extensions in it and not duplicate any of them per application instance.

Again, package must be autoloaded, as far as I tested.