Ben Greenman fae58e140d add types for Immutable-HashTable, Mutable-HashTable, Weak-HashTable (#559) ... The old 'HashTable' type is now the union of the other 3 hash types. - all operations that used to work on 'HashTable's still work, but some now have more specific outputs - `#hash` literals have type `ImmutableHash` - `immutable?` and `hash-weak?` are filters - `Mutable-` and `Weak-` hashes have corresponding `Top` types, `HashTableTop` is now a union - the contact for `(U (Immutable-Hash K1 V1) (Mutable-Hash K2 V2))` is ONE `hash/c` Minor notes: - renamed internal identifiers containing 'Hashtable' to all use 'HashTable' - add Racket guide/reference 'secref' functions		2017-06-26 18:00:19 -04:00
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succeed	add types for Immutable-HashTable, Mutable-HashTable, Weak-HashTable (#559)	2017-06-26 18:00:19 -04:00