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The easiest way to treat complex arguments is to
just normalise them away..

In bdc545ff we have introduced a conjg the
Bernoulli polynomial. It is not clear why.

Courtesy to Roman Zwicky and Ben Pullin for
pointing this out.

Something was changed in gcc 7->8 that made gcov
report incorrect evaluation times for multi-line
expression. Don't know what it was, don't care.