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(cherry picked from commit 7ad5f7a5)

This is currently disabled. There is no real point
here, it's fast either way.

In (60) of VW the branch cut was wrong (also in
Mathematica). I misunderstood the meaning of

if (a.back() > 0) {
    new_pending_integrals.push_back(-scale);
    result += I*Pi;
} else {
    new_pending_integrals.push_back(scale);
    result -= I*Pi;
}

in GiNaC

Create LICENSE