+/- \infty doesn't change bracket direction when +- syntax is used.

[ankaa3908]

The +- syntax currently isn't compatible with the bracket's changing direction feature when -\infty & +\infty are used:

\begin{equation}
   \integral[limits*={+-\infty}]{f}
\end{equation}

[ankaa3908]

Arguably, the real keyword should be used instead, but what if it's redefined as the user prefers to write \int_{-\infty}^{+\infty} like in the above example?