Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

From: Stefan Monnier <[email-masked]>
Date: Thu, 09 Jul 2020 10:35:51 -0400

> What's your suggestion on this optimization? Do you think can be on with
> default settings or is it dangerous?

AFAICT it's been on since Emacs-21, which seems to argue for "not too dangerous".

        Stefan