Can numden return non-simplified results?

When I use numden on a symbolic expression, numden simplifies the expression first (canceling out common factors) before returning the numerator and denominator.

D= (x^2-1) / (x+1);
[n,d] = numden(D)
n = x - 1
d = 1

Is there a way to avoid this or another function that doesn't simplify expressions before returning numerators and denominators? The behavior I would like is:

D= (x^2-1) / (x+1);
[n,d] = numden(D)
n = x^2 - 1 
d = x + 1

Thanks.