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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Converting an Integer into Human Readable String
Date: Thu, 07 Apr 2011 21:35:00 +0300
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> From: "Drew Adams" <drew.adams@oracle.com>
> Date: Thu, 7 Apr 2011 11:13:07 -0700
> 
> > > (format-mode-line "%I" 4060) -> "4.6k"
> > 
> > Beware: this has side effects.  It doesn't just return a string.
> 
> What side effects?

It affects the display.

> Where are they documented?

In the ELisp manual.