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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: RFC: String interpolation
Date: Wed, 14 Dec 2016 12:00:59 -0500
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  > (format "Altitude= %.2f%" (+ alt 100) ", direction = %.2f%" (- dir) ".")

That interface seems pretty clean.

-- 
Dr Richard Stallman
President, Free Software Foundation (gnu.org, fsf.org)
Internet Hall-of-Famer (internethalloffame.org)
Skype: No way! See stallman.org/skype.html.