[pypy-dev] plans for the peg parser in pypy 3.9

[Simon Cross]

> - CPython made it possible to switch between the old and the new parser
> in 3.9 with an environment variable. Unless somebody gives extremely
> strong reasons for also having that feature, I would like to focus on
> using the new parser exclusively. Being able to switch is quite a big
> hassle, and I don't see it buying a lot.

That approach sounds good to me!