Slightly incorrect image size during zooming?

[cgilhuly]

mrf/mrf/celestial.py

Line 412 in 4817375

nx=int((nx -1) * f + 1), ny=int((ny - 1)* f + 1))

Using (n_x/y - 1) * f + 1 to rescale image results in final zoomed image being f - 1 pixels too small in each dimension (at least for integer values of f). Is this intentional?