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### D.6.1 `gslevu` calling conventions

The input to either of these functions is a list of real numbers represented as explained in `math`.

The result is a pair `(s,e)` holding an estimate of the sum, s, and an estimate of the error in the sum, e, each being a real number.

Both functions compute the same sum, s, but the `utrunc` function is faster and more memory efficient, using a less trustworthy method of estimating the error.

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