[API CHANGES]
+ * The ->parent and ->parents method for a union now return the nearest
+ common ancestor of that union's component types. See Moose::Manual::Delta
+ for more details. (Dave Rolsky)
+
* The ->is_subtype_of and ->is_a_type_of methods have changed their
behavior. Previously, they returned true if any of their member types
returned true for a given type. Now, all of the member types must return