Support default implementations for polymorphic enums (XSTR-487). Treat all enums as immutable types (XSTR-419).
Support default implementations for polymorphic enums (XSTR-487).
Treat all enums as immutable types (XSTR-419).

git-svn-id: fe6d842192ccfb78748eb71580d1ce65f168b559@1407 9830eeb5-ddf4-0310-9ef7-f4b9a3e3227e

svn2github/xstream,svn2github/xstream