It seems like the PR 7043 has no big impact on performances. Sometimes, it's a little bit faster, sometimes it's a little bit slower. The trend is a little bit more in the "faster" side, but it's not very obvious.

I approved PR 7043. It shouldn't break the world, it might only break very specialized Python extensions touching very low level details of the Python implementation. The performance seems ok, but it reduces the memory footprint which is a very good thing!