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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Strange division using mixed integers and floats
Date: Wed, 28 Apr 2004 06:13:14 -0400
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    But this behaviour is *highly* confusing:

    (/ 5 4 2.3) => 0.4347826086956522

    Cf. (/ 5 4.0 2.3) => 0.5434782608695653

We could change the functions to convert the arguments to
floating point at the start if any is floating point.

Is there any reason not to do that?