- Patch #601570 by effulgentsia: hook_exit() and other cleanup needs to happen for AJAX requests too.

- Patch #572618 by effulgentsia, pwolanin, sun: all theme functions should take a single argument. Code clean-up and performance improvement. Woot.

- Patch #331171 by pwolanin, mfb, drewish: allow modules to alter the MIME extension mapping rather than setting a huge variable.

- Patch #460320 by catch, fago, Frando: standardized, pluggable entity loading for nodes, users, taxonomies, files and comments.

#497118 by chx, catch, pwolanin, JoshuaRogers, and Jacob Singh: Remove the function registry. While the hope was that this would result in improved performance for low-end hosts, it comes at the expense of critical development experience problems and less benefit than something like APC. Class registry remains intact to facilitate autoloading.

Of all the patches to accidentally commit without a message. :( Rolling back registry rip. Let's try that again.

#552066 by quicksketch and pwolanin: Fix bug with file_save_upload() and trailing slashes (with tests).

#517814 by jmstacey, justinrandell, pwolanin, drewish, Jody Lynn, aaron, dopry, and c960657: Converted File API to stream wrappers, for enhanced private/public file handling, and the ability to reference other storage mechanisms such as s3:// and flicker://.

- Patch #493466 by arianek, jhodgdon: documentation for file_save_upload inaccurately describes a parameter.

- Patch #227232 by dopry, c960657, jmstacey, pwolanin, aaron, drewish: added initial support for PHP file wrappers.

- Patch #520664 by rfay, quicksketch: file_get_mimetype() should not be case-sensitive. Comes with more and better tests.

- Patch #473652 by Damien Tournoud, catch: removed unneeded loop from file_get_mimetype() and further clean-up.