Documentation for QIODevice::seek is off-by-not

#include <QDebug>

class MyDevice : public QIODevice
{
public:
  MyDevice(QObject *parent = 0) : QIODevice(parent) {}

  bool isSequential() const { return true; }

protected:
  virtual qint64 readData(char*, qint64) { return 0; }
  virtual qint64 writeData(const char*, qint64) { return 0; }
};

int main(int argc, char **argv)
{
  MyDevice d;
  qDebug() << d.open(QIODevice::ReadOnly);
  qDebug() << d.isSequential();
  qDebug() << d.seek(0);
}


$ ./iodevsequential 
true 
true 
true