QLocale::toDouble return inf for incorrect input

#include <QCoreApplication>
#include <QLocale>
#include <QString>
#include <QDebug>
int main(int argc, char *argv[])
{
 QCoreApplication a(argc, argv);
QLocale c(QLocale::C);
 bool ok;
 QString str = "1.7976931348623157e309";
 qDebug() << c.toDouble(str, &ok) << ok; // print "inf false"
return a.exec();
}