Setting the rounding mode influences output of double

Protect_FPU_rounding.cpp

// Produces this output
// https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-5.5-Ic-5/Polynomial/TestReport_Christo_MSVC2017-Debug-64bits.gz
// 3
// 3.0000000000000001

#include <CGAL/Interval_nt.h>

int main() {

    double d = 3;
    std::cout.precision(17);
    std::cout << d << std::endl;

    CGAL::Protect_FPU_rounding<true> pfr(CGAL_FE_UPWARD);

    std::cout << d << std::endl;
    return 0;
}