public OpenAddressingHashTable(int capacity, ProbingType type = ProbingType.Linear) : base(capacity)
        {
            _elements = 0;
            Keys = new NullableArray<TKey>(capacity);
            Values = new DynamicArray<TValue>(capacity);

            switch(type) {
                case ProbingType.Linear:
                    _probe = (x) => x * 17;
                    break;
                case ProbingType.Quadratic:
                    _probe = (x) => (x * x + x) >> 1;
                    break;
            }
        }
 public override void Clear()
 {
     Keys = new NullableArray<TKey>(_capacity);
     Values.Clear();
 }