title: random over a range, is number bias present for new rand() version?
body: <p>reading from various other SO questions, when using rand() % N you may happen to modify the bias for the pseudo number you get, so you usually have to introduce some range handling.</p>
  
  <p>However in all cases rand() was always mentioned, and not the newer random() or arcrandom4() functions or the native C++11 methods. What happens when you run these routines over a set? Do you get a bias like rand()?</p>
  
  <p>Thanks.</p>