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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Nested sit-for's
Date: Thu, 18 Oct 2007 01:02:38 -0400
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    > To enable that, I added a function current-idle-time.

    Is there any reason for `current-idle-time' returning nil when Emacs
    is not idle, instead of (0 0 0)?

I think it is convenient for it to return nil to indicate
"not idle", and if you wish it were (0 0 0), it is easy to
write (or ... '(0 0 0)).