[3.13] gh-124960: Fixed `barry_as_FLUFL` future flag does not work in new REPL (#124999) (#125475)

gh-124960: Fixed `barry_as_FLUFL` future flag does not work in new REPL (#124999)

Co-authored-by: Wulian <xiguawulian@gmail.com>
Co-authored-by: Nice Zombies <nineteendo19d0@gmail.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
(cherry picked from commit 6a08a753b702ac63c9b6ac58dd204d1fe9662e9d)