Named parameter issue, or bug in cake

I've got such problem.
i have categories controller with 3 methods, index-do nothing,
show(id=null), copy id to show.ctp, and last:
function badRequest() {
$this->cakeError('error404');
}

in view file index.ctp i have link to show method:
//index.ctp file
echo $html->link("Show", array('controller' => 'categories', 'action'
=> 'show', 'id' => 12, 'bod' => 'zofa'));
------------------------//end of file

i have also coustom routing:
//routers.php file

Router::connectNamed(array('bod' => '.{4}'));

Router::connect('/writings/:id/*', array('controller' => 'categories',
'action' => 'show'),
array(
'pass' => array('id'),
'id' => '.{2}'
));

Router::connect('/categories',array('controller' => 'categories'));
Router::connect('/categories/*',array('controller' => 'categories',
'action' => 'badRequest'));
.------------------------------------------end router file

And now in my index.ctp. when i click Show link, the browser redirect
me to page:http://localhost/kejk-1.3.4-0/writings/12/bod:zofa
, and thats ok.
When i change the id to 123 in show.ctp file, this cause routing
create such link in show link:
http://localhost/kejk-1.3.4-0/categories/show/id:123/bod:zofa

because the regex 'id'=>'.{2} not match, and when i click it, FF
redirect me to method badRequest, and i will se error 404, and thats
ok, work fine,

Now change id to 12 again in index.ctp file.
this will create good link to show link, again:http://localhost/
kejk-1.3.4-0/writings/12/bod:zofa
and clicking it redirect to method show, and now change in browser 12
to 123, and there will be error 404 because regex of routing 'id'=>'.
{2} will not be matched. (sorry of my english)
and thats ok, works fine.

And now when i change bod in index.ctp. to zof, cake create link to
show like:
http://localhost/kejk-1.3.4-0/categories/show/id:12/bod:zof
routing not match to writings because zof not match to regex .{4},
and click on it link will cause redirect to method badRequst, and
error 404 on screen. and thats ok.
but change again bod to zofa, and click in proper link:http://
localhost/kejk-1.3.4-0/writings/12/bod:zofa,
page writings is opened

And finaly the problem or rather a bug in cakePHP, when I in this good
link: http://localhost/kejk-1.3.4-0/writings/12/bod:zofa
change zofa to zof in browser, not in show.ctp file, routing will not
redirect me to page 404 because the regex
fail:Router::connectNamed(array('bod' => '.{4}')); like this has in id
situation(changed 12 to 123), but just show normal page with named
param bod=>zof

is that shoud be or this is a bug.

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