Subject: bug#44854: [PATCH] Add lexical-binding cookie to autoload files

From: Eli Zaretskii <[email-masked]>
Date: Wed, 25 Nov 2020 22:00:34 +0200

> From: Philipp Stephani <[email-masked]>
> Date: Wed, 25 Nov 2020 20:35:54 +0100
> Cc: Stefan Monnier <[email-masked]>, Stefan Kangas <[email-masked]>, [email-masked]
> 
> > > Because when we change the default (not sure what that could be, 2030
> > > maybe?), it will change the way existing files are treated except those
> > > that have a `lexical-binding:` cookie.  Clearly, this is dangerous
> >
> > Dangerous for loaddefs.el? why?
> 
> This is just basic risk management.

When there's risk, yes.  But I see no risk whatsoever in this case.