camera bug: fully zoomed out camera flips when rotated above av

Steps to reproduce the bug: Click on your av to get the camera "focused" on it (but don't alt-click to focus the cam on your av that way--though you can for comparative purposes). Zoom the cam all the way out (can't while clicking on av, for some reason). Rotate the cam up so it points down at your av.

Observed results: When the cam rotation reaches the perpendicular position (90 degrees vertical), it flips/inverts the view. Compare this to alt-click-focusing the cam on your av, zooming out (which zooms out more, incidentally), and rotating up perpendicular to the av and no view flip/inverse occurs.

Expected results: Consistent camera rotation and zooming. The camera should not go beyond perpendicular when rotated (by default--an option to and another option to flip it when it does, or leave it upsidedown, would be nice).