Forms with an enctype of 'multitype/form-data' do not register the POST variables.

Here's how to reproduce:

----- Short Script Follows -----
<?
print_r($HTTP_POST_VARS);
?>
<form method=post enctype='multipart/form-data'>
        <input type='text' value='<? print $foo ?>' name='foo'>
        <input type='submit'>
</form>
----- End Script -----

Run the script above.   It is simple enough - it has a form that submits to itself, and then displays the HTTP_POST_VARS variable.

When I remove the enctype='multipart/form-data' attribute from the form tag, the script works fine (i.e. the variable 'foo' appears).   The enctype directive appears to surpress the variables.