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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Extra arg in interactive?
Date: Sat, 07 Jul 2007 09:06:19 -0400
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Xref: news.gmane.org gmane.emacs.devel:74433
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    I find it handy in string input to use the region string if it is active, or 
    read from user if it is not.

For some commands, this could be natural.  But there are commands
for which it doesn't make sense, such as write-region.