public BigIntegerBC AndNot(
			BigIntegerBC val)
		{
			return And(val.Not());
		}
		public BigIntegerBC And(
			BigIntegerBC value)
		{
			if (this.sign == 0 || value.sign == 0)
			{
				return Zero;
			}

			int[] aMag = this.sign > 0
				? this.magnitude
				: Add(One).magnitude;

			int[] bMag = value.sign > 0
				? value.magnitude
				: value.Add(One).magnitude;

			bool resultNeg = sign < 0 && value.sign < 0;
			int resultLength = System.Math.Max(aMag.Length, bMag.Length);
			int[] resultMag = new int[resultLength];

			int aStart = resultMag.Length - aMag.Length;
			int bStart = resultMag.Length - bMag.Length;

			for (int i = 0; i < resultMag.Length; ++i)
			{
				int aWord = i >= aStart ? aMag[i - aStart] : 0;
				int bWord = i >= bStart ? bMag[i - bStart] : 0;

				if (this.sign < 0)
				{
					aWord = ~aWord;
				}

				if (value.sign < 0)
				{
					bWord = ~bWord;
				}

				resultMag[i] = aWord & bWord;

				if (resultNeg)
				{
					resultMag[i] = ~resultMag[i];
				}
			}

			BigIntegerBC result = new BigIntegerBC(1, resultMag, true);

			// TODO Optimise this case
			if (resultNeg)
			{
				result = result.Not();
			}

			return result;
		}