pub fn fill_bytes_via_next<R: RngCore + ?Sized>(rng: &mut R, dest: &mut [u8])
next_u32, little-endian order.
The fastest way to fill a slice is usually to work as long as possible with
integers. That is why this method mostly uses
next_u64, and only when
there are 4 or less bytes remaining at the end of the slice it uses