[TIMOB-1454] iPhone text area does not animate height properly

I have no idea if this problem is at the Titanium or native iPhone animation level. Maybe somebody could confirm whether this is working as intended:

Code to reproduce: http://pastie.org/pastes/1067814">http://pastie.org/pastes/1067814

Paste the above code into a new iPhone application. Press the "Animate" button. The text area will grow and shrink, but there will be an obvious visual anomaly.
The white border of the text area animates properly. But the white background of the text area does not animate the way it should. It should follow the behavior of the white border, but instead jumps erratically.