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Right now we only intern unions.\r\n\r\nRep generic operations: we use Racket's generics.\r\n\r\nSingletons: Reps can be declared singleton, which creates a single\r\ninstance of the rep and all visible operations (even within the\r\ndeclaring module) are defined in terms of that singleton instance\r\n(e.g. predicate is defined as (λ (x) (eq? x singleton-instance)), etc).\r\n\r\nCustom constructors: A custom constructor can be specified for a Rep,\r\nwhich allows for simple normalization or other invariants to be\r\nenfored universally when a Rep is created (they should be lightweight).\r\n\r\nUnion: Unions now only enforce the following invariants on their\r\nmembers: (1) No duplicates (by virtue of using a hash-based set), (2)\r\nAny and Nothing do not appear in unions, (3) Nested unions are\r\nflattened\r\n\r\nContract generation: When generating contracts for unions, we\r\n(recursively) reduce the types so that there is no obvious overlap\r\nbetween types w.r.t. subtyping. See union.rkt for 'normalize-type'\r\n\r\n\r\nSubtyping changes: Subtyping has been designed to reduce dispatch time\r\nw/ a switch since we no longer cache all subtyping calls (we only\r\ncache subtyping results for unions)\r\n\r\nTesting: More subtype tests have been added (we are still relying too\r\nmuch on typecheck-tests.rkt and not the more granular unit tests).\r\nTypecheck-tests has been changed to check for type-equivalence (i.e.\r\nsubtyping in both directions) instead of 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