typenames.i, double * and python

I'm new to this SWIG thing, but I've been working with Python for awhile now.  
I'm having problems getting a double * to work with swig/python.  I can get int 
* values to work fine, but every double * I've tried (including some examples 
pulled from the typenames.i file) don't seem to.  I've copied my test.i, 
test.c, and a sample output in this message.  Also, I'm using the latest Python 
(2.3.4rc1) and ditutils.  Oh yeah, and Windows (against my will, I promise).  
Any ideas?

test.i
-------

%module test
%include "typemaps.i"

%types(int *, short *, long *, float *, double *);

int twice(int *INPUT);
double twotimes(double *INPUT);



test.c
--------
%module test
%include "typemaps.i"

%types(int *, short *, long *, float *, double *);

int twice(int *INPUT);
double twotimes(double *INPUT);



Python session
---------------------
>>> import _test
>>> _test.twice(3)
6
>>> _test.twotimes(3)
1244484.0
>>> _test.twotimes(3.0)
1244484.0
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