Github user sethah commented on the issue:
    Ok, it's fairly safe since it's limited to `private[linalg]`. The confusion 
for me is that this method introduces all sorts of edge cases which have 
behavior that is not at all obvious or clear. If we don't think we need to test 
all of these edge cases, I'd like to at least be very explicit in the method 
doc, e.g.:
       * This method is used to avoid re-computing the number of non-zero 
elements when it is
       * already known. This method should only be called after computing the 
number of non-zero
       * elements via [[numNonZeros]]. e.g.
       *   {{{
       *     val nnz = this.numNonZeros
       *     val sv = toSparse(nnz)
       *   }}}
       * If `nnz` is under-specified, a 
[[java.lang.ArrayIndexOutOfBoundsException]] is thrown.

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