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From: Richard Stallman <rms@gnu.org>
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Subject: Re: RFC: String interpolation
Date: Tue, 13 Dec 2016 12:41:59 -0500
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  > I mean, %{thing}.2f isn't a valid formatting directive today, so I'm
  > afraid I don't quite see the ambiguity.

Perhaps I misunderstood that proposal.  Would %{thing} by itself be
valid?
-- 
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.