public DictionaryImpl(ImmutableSortedList <TKey, TValue> immutableSortedList)
 {
     _immutableSortedList = immutableSortedList;
 }
 public static ImmutableSortedList <TKey, TValue> FromValues <TKey, TValue>(IEnumerable <KeyValuePair <TKey, TValue> > keyValuePairs, IComparer <TKey> keyComparer)
 {
     return(ImmutableSortedList <TKey, TValue> .FromValues(keyValuePairs, keyComparer));
 }