> I'm not sure of the usefulness of this comment.
removing, then.

> "else" redundant here.

> Instead of using a local variable "intersected", you can simply add "else
> Py_INCREF(other)" here and then decref "other" unconditionally. It will be
> shorter and perhaps a little clearer, but a bit slower.

I find my first patch more readable and efficient, but if these comments are conformant to pep7.. 
Attaching updated patch (issue8425.3.patch)


> Did you run benchmarks in debug mode?
Yes, but bench.py is available, fell free to run it with whatever configuration; my example was done with a --with-pydebug and clang compiler. 

> In order for results to be convenient to compare please sort it by name.
Done.