As Emanuel noted, this is a new feature, and hence won't be backported to any earlier versions.

For What's New, it turns out that didn't quite render the way I expected, since the "StackSummary" class reference is missing in addition to the "traceback" module reference.

So I'll tweak that, and also try to make it clearer that all tracebacks are affected, not just those printed via the traceback module (PyTraceback_Print is mentioned further down, but what I'll probably do is add an example of an infinite recursion being truncated at the interactive prompt)