qjson int64 range

[oop]

Hello all,
I am running ina trouble, I need to work with int64 but I did not found a solution except to use they like strings.
In the following program the statement 'Doc.object()["ID"].toDouble();' return very close value but not exact, in my environment.
There is some way to extract the entire number without use the string form ("IDs":"635913899220803700") ?

#include <QtCore/QCoreApplication>
#include <QJsonDocument>
#include <QJsonParseError>
#include <QJsonObject>
 
int main(int argc, char *argv[]){
	QCoreApplication a(argc, argv);
 
	QString message=R"RR({"ID":635913899220803700,"IDs":"635913899220803700"})RR";
	QJsonParseError err;
 
	QJsonDocument Doc=QJsonDocument::fromJson(message.toUtf8(),&err);
 
	unsigned long long ia=Doc.object()["ID"].toDouble();
	unsigned long long ib=_atoi64(Doc.object()["IDs"].toString().toUtf8().data());
	_ASSERT(ia==ib);
 
	return a.exec();
}

#include <QtCore/QCoreApplication>
#include <QJsonDocument>
#include <QJsonParseError>
#include <QJsonObject>

int main(int argc, char *argv[]){
	QCoreApplication a(argc, argv);

	QString message=R"RR({"ID":635913899220803700,"IDs":"635913899220803700"})RR";
	QJsonParseError err;

	QJsonDocument Doc=QJsonDocument::fromJson(message.toUtf8(),&err);

	unsigned long long ia=Doc.object()["ID"].toDouble();
	unsigned long long ib=_atoi64(Doc.object()["IDs"].toString().toUtf8().data());
	_ASSERT(ia==ib);

	return a.exec();
}

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Cheers,
Giorgio