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From: "Richard M. Stallman" <rms@gnu.org>
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Subject: Re: expt weirdness in floatfns.c
Date: Sat, 06 Aug 2005 14:35:54 -0400
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    I couldn,t understand the c code, but it seems to do this: 

     /* don't promote to floats, if both are ints */

The comment suggests this was for compatibility with Common Lisp.
We may as well not change it.