Just for the record, I consider PEP 479 one of (very rare) design bugs in Python, and would like it reversed some day. (So anything that helps this outcome, including -1 on this, is welcome.)

It subverts the natural property of exceptions (that they bubble through frames undisturbed until caught) for no benefit at all, and it has made me write almost every chained generator since then in a more complex way, adding boilerplate code that converts inner StopIteration to return. I'm sure many others have done so too. Ceterum censeo PEP479em esse delendam.