TYPO3 Core

AbstractFileFolder::$originalResource has the following type annotation:
\TYPO3\CMS\Core\Resource\ResourceInterface|\TYPO3\CMS\Core\Resource\AbstractFile|\TYPO3\CMS\Core\Resource\Folder|\TYPO3\CMS\Core\Resource\FileReference

This means, it has four possible types annotated. This can be slimmed, since all classes implement \TYPO3\CMS\Core\Resource\ResourceInterface anyway. This also affects Extbase models, where the new ClassSchema throws an exception as it can't handle multiple types.