fails:ObjectSpace.reachable_objects_from returns nil for true and false
fails:ObjectSpace.reachable_objects_from returns nil for nil
fails:ObjectSpace.reachable_objects_from returns nil for small Integers
fails:ObjectSpace.reachable_objects_from enumerates objects directly reachable from a given object
fails:ObjectSpace.reachable_objects_from finds an object stored in an Array
fails:ObjectSpace.reachable_objects_from finds an object stored in a copy-on-write Array
fails:ObjectSpace.reachable_objects_from finds an object stored in a Queue
fails:ObjectSpace.reachable_objects_from finds an object stored in a SizedQueue
