Whether the cache will automatically evict discardable-content objects whose content has been discarded.
- iOS 4.0+
- macOS 10.6+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
YES, the cache will evict a discardable-content object after its content is discarded. If
NO, it will not. The default value is