- deprecated the component: use Composer instead
- The DebugClassLoader class has been removed
- The DebugUniversalClassLoader class has been removed
- The UniversalClassLoader class has been removed
- The ApcUniversalClassLoader class has been removed
- deprecated the UniversalClassLoader in favor of the ClassLoader class instead
- deprecated the ApcUniversalClassLoader in favor of the ApcClassLoader class instead
- deprecated the DebugUniversalClassLoader in favor of the DebugClassLoader class from the Debug component
- deprecated the DebugClassLoader as it has been moved to the Debug component instead
- added a WinCacheClassLoader for WinCache
- added a DebugClassLoader able to wrap any autoloader providing a findFile method
- added a new ApcClassLoader and XcacheClassLoader using composition to wrap other loaders
- added a new ClassLoader which does not distinguish between namespaced and pear-like classes (as the PEAR convention is a subset of PSR-0) and supports using Composer's namespace maps
- added a class map generator
- added support for loading globally-installed PEAR packages