[$] The return of None-aware operators for Python

The saga of the None-aware (or null-coalescing) operators for Pythoncontinues. We last looked in on the topica little over a year ago and noted that either adoption or a clearrejection of the idea might help tamp down its regular recurrence. Thathas not happened, so, predictably, it was raised again-and does not lookany closer to resolution this time around.