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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#44854: [PATCH] Add lexical-binding cookie to autoload files
Date: Wed, 25 Nov 2020 22:00:34 +0200
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 (message from Philipp Stephani on Wed, 25 Nov 2020 20:35:54 +0100)
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> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Wed, 25 Nov 2020 20:35:54 +0100
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, Stefan Kangas <stefan@marxist.se>, 44854@debbugs.gnu.org
> 
> > > 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.