ZF-2891: Detach Zend_Cache from Zend_Loader
All ZF components should be loosly coupled and be able to be used alone without other components if possible.
Zend_Cache_Backend for example:
// Create a default logger to the standard output stream Zend_Loader::loadClass('Zend_Log_Writer_Stream');
A simple require_once would be faster and would decouple it from Zend_Loader, which makes it possible to use Zend_Cache without Zend_Loader. There are a few other places in Zend_Cache where this should also be decoupled.