code: public double[] toNativeArray() {
          final double[] arr = new double[getNumImplicitEntries()];
          iterate(new FnIntDoubleToVoid() {
              @Override
              public void call(int idx, double val) {
                  arr[idx] = val;
              }
          });
          return arr;
      }
docs: Gets a NEW array containing all the elements in this vector.