Rubberduck.Parsing.Preprocessing.LogicalOrExpression.Evaluate C# (CSharp) Method

        public override IValue Evaluate()
        {
            var left = _left.Evaluate();
            var right = _right.Evaluate();
            if (left == null && right == null)
            {
                return null;
            }
            else if (left == null)
            {
                return right;
            }
            else if (right == null)
            {
                return left;
            }
            else if (left.ValueType == ValueType.Bool && right.ValueType == ValueType.Bool)
            {
                var leftNumber = Convert.ToInt64(left.AsDecimal);
                var rightNumber = Convert.ToInt64(right.AsDecimal);
                return new BoolValue(new DecimalValue(leftNumber | rightNumber).AsBool);
            }
            else
            {
                var leftNumber = Convert.ToInt64(left.AsDecimal);
                var rightNumber = Convert.ToInt64(right.AsDecimal);
                return new DecimalValue(leftNumber | rightNumber);
            }
        }
    }