public Collectionary(bool unique = false)
{
_underlyingDictionary = unique ? LazyDictionary.Create <TKey, ICollection <TValue> >(() => new HashSet <TValue>()) : LazyDictionary.Create <TKey, ICollection <TValue> >(() => new List <TValue>());
}
public Collectionary(IEqualityComparer <TValue> listComparer)
{
_underlyingDictionary = LazyDictionary.Create <TKey, ICollection <TValue> >(() => new HashSet <TValue>(listComparer));
}