x0 + x1 + ... + xn
| InvalidOperationException | any x is signaling NaN |
| InvalidOperationException | there are two infinite elements with different sign |
| OverflowException | result is too big to be represented |
| UnderflowException | result is too small to be represented |
| InexactException | result is inexact |
Sums elements of x using a higher precision, rounding only once at the end.</br>