good first issue
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説明
It would be nice if TR provided a built-in Dictionary type. At its simplest, it would just be (U (HashTable a b) (Listof (Pairof a b)), but vectors are also technically dictionaries.
Does TR's type system allow "specializations" of types? I.e. some way to define a special case for (Dictionary Integer b) that includes vectors?
Technically, dictionaries also include structures that implement gen:dict, but obviously generics don't exist in TR yet.