Remove IDictionary from IIsADictionary<TKey,TValue> definition #2399
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This removes any ambiguity when enumerating the items in an instance of
IIsADictionary<TKey,TValue>.Any implementation of
IIsADictionary<TKey, TValue>must always provide implementations for the contract ofIDictionary<TKey, TValue>so there is little value in having theIDictionarycontract where boxing and unboxing will be incurred, except to distinguish types that implementIDictionarythat are notIIsADictionary.Removes the cost boxing of values in
VerbatimDictionaryKeysConverterby havingTKeyandTValuegeneric type parameters.