Strange float behavior



Hi all.  I'm seeing some odd behavior of the float command when I try
using it on output from the current units package.  Can anyone
reproduce this or is this just a local quirk?  (Using latest cvs
everything + sbcl 0.8.20 + post_eval_function patches.)

Thanks,
CY

Maxima 5.9.1.1cvs http://maxima.sourceforge.net
Using Lisp SBCL 0.8.20
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
(%i1) load("./newunits.mac");
******************************************************************* 
*                       Units version 0.11                        * 
*          Definitions based on the NIST Reference on             * 
*              Constants, Units, and Uncertainty                  * 
*       Conversion factors from various sources including         * 
*                   NIST and the GNU units package                * 
******************************************************************* 
 
Initializing unit arrays... 
Done. 
(%o1)                           ./newunits.mac
(%i2) load("physics/physconst.mac");
(%o2)   /usr/local/share/maxima/5.9.1.1cvs/share/physics/physconst.mac
(%i3) ev(%%c,numer);
                                  299792458 m
(%o3)                             -----------
                                       s
(%i4) setunits([km,minutes]);
(%o4)                                done
(%i5) ev(%%c,numer);
                                 449688687 km
(%o5)                            ------------
                                   25 %min
(%i6) %o3-%o5;
(%o6)                                  0
(%i7) float(%o5);
                                  35975095 km
(%o7)                             -----------
                                    2 %min
(%i8) %o3-%o7;
                                       km
(%o8)                              - -------
                                     50 %min
(%i9) %o5-%o7;
                                       km
(%o9)                              - -------
                                     50 %min


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