- math/rand
  The math/rand package now automatically seeds the global 
  random number generator (used by top-level functions like 
  Float64 and Int) with a random value, and the top-level 
  Seed function has been deprecated. Programs that need a 
  reproducible sequence of random numbers should prefer to 
  allocate their own random source, using 
  rand.New(rand.NewSource(seed)).
  (...)