How to change the size/shape of a Physics Object dynamically?

I tried transform.set_scale, but it does not work on physics objects.

I also tried shape keys, and they work, but only on the object mesh - the object's collision bounds do not change along with the mesh, and therefore it's insufficient for my purpose (I need correct collision detection of the object after its size or shape change). Using update_boundings() did not help.

Hi, it is true that the animated scale does not work with physical objects, it only occurs to me to duplicate the scaled final object, apply its physics and hide or show the object of our interest.