In 'Hyperbolic functions' section, (atanh 1.0+0.0i) is expected to
return +inf.0+.7853981633974483i (+inf.0+pi/4i), which is different from
C99 Annex G

> If z is +1+0i, the result is +∞+0i and FE_DIVBYZERO is raised

-- https://en.cppreference.com/c/numeric/complex/catanh

Do we have good reasons to not following C99?
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Zihao / 閱卜錄