Subject: bug#12314: 24.2.50; `add-to-history': use `setq' with `delete'

From: Eli Zaretskii <[email-masked]>
Date: Sun, 09 Sep 2012 20:14:23 +0300

> From: Stefan Monnier <[email-masked]>
> Cc: [email-masked],  [email-masked],  [email-masked]
> Date: Sun, 09 Sep 2012 10:44:01 -0400
> 
> >> Because it avoids memory allocation.  I.e. 99% of the uses of
> >> delete/delq/nconc are simple optimizations.
> > I meant "why does it matter FOR THE USER that the modification was
> > destructive?"  Users don't care about optimizations, they only care
> > about performance.
> 
> Because this optimization improves performance,

But this optimization was already done.  We don't tell users in the
manuals about each and every optimization we do to improve
performance, do we?