ZF-5208: Zend_Loader_PluginLoader : __constructor() breaks each staticRegistry everytime.
Documents says that "Other components that instantiate the PluginLoader using the same registry name will then have access to already loaded paths and plugins. "
But in __constructor(),each staticRegistry will be initialized everytime.
self::$_staticPrefixToPaths[$staticRegistryName] = array();
self::$_staticLoadedPlugins[$staticRegistryName] = array();
Maybe, I supporse that these initCodes have to be checked "! isset()".