- Use stxclass for defintern/dt/de
- Add type keys to optimize subtyping
- Fancier printing when regular printing is disabled for debugging.
- Caching of the results of subtyping.
- Contracts for hashtable types (still insufficent)
- add type for `last-pair' from `scheme/list'
- new "private/type-abbrev.ss" which contains things
from "private/type-effect-convenience.ss" that don't
need subtyping/unions
- Don't use the real union constructor on mu unfolding
- more work on (not yet enabled) stxclass type parser
- Naming sanity in tests
svn: r13628