_maybe_real(A, B, tol=None)
The motivation is that B has been computed as a complicated function of A, and B may be perturbed by negligible imaginary components. If A is real and B is complex with small imaginary components, then return a real copy of B. The assumption in that case would be that the imaginary components of B are numerical artifacts.
Input array whose type is to be checked as real vs. complex.
Array to be returned, possibly without its imaginary part.
Absolute tolerance.
Either the input array B or only the real part of the input array B.
Return either B or the real part of B, depending on properties of A and B.
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