Strange division using mixed integers and floats

[Johan Bockgård]

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In GNU Emacs 21.2.1 (sparc-sun-solaris2.8, X toolkit)
 of 2002-09-24 on nob.dd.chalmers.se
configured using `configure  --x-includes=/opt/pd/include/ 
--x-libraries=/opt/pd/lib --prefix=/rec/emacs-21.2/'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: iso_8859_1
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Ok, I know why this happens:

(/ 5 4) => 1

But this behaviour is *highly* confusing:

(/ 5 4 2.3) => 0.4347826086956522

Cf. (/ 5 4.0 2.3) => 0.5434782608695653

At least there should be a warning in the manual.

Recent input:
C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O D q 
ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC 
O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B 
ESC O B ESC O B ESC O B C-l ESC O A ESC O A ESC O A 
C-x b C-g ESC O A ESC O B ESC O B ESC x r e p o r t 
TAB RET

Recent messages:
Region saved
-1
0
0.0
Entering debugger...
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Back to top level.
Mark set
iswitchb-read-buffer: Quit
Loading emacsbug...done

-- 
Johan Bockgård