toVector

1. Is it OK if I put in DenseVector.toVector() in addition to toArray()?
2. Can you check the comments for DenseVector.scala Line 169 below, I think it might have been ?wrong
3. What is the reason that DenseVector[] doesn't support Long? For the Signal Processing, some faster integer algorithms could use it, to lessen the risk that Int overflows... not critical, but just wondering for my information.