Urgency bug, or am I missing something?

["Wesley J. Landaker" <wjl@icecavern.net>]

Hi folks,

I just uploaded a security fix to unstable, with high urgency. However, I got 
this response:

On Wednesday 02 August 2006 12:02, you wrote:
> Warning: high (security) is not a valid urgency; it will be treated as low
> by testing.
>
> Accepted:
> cheesetracker_0.9.9-6.diff.gz
>   to pool/main/c/cheesetracker/cheesetracker_0.9.9-6.diff.gz
> cheesetracker_0.9.9-6.dsc
>   to pool/main/c/cheesetracker/cheesetracker_0.9.9-6.dsc
> cheesetracker_0.9.9-6_i386.deb
>   to pool/main/c/cheesetracker/cheesetracker_0.9.9-6_i386.deb

The changes looks right:

> Format: 1.7
> Date: Wed,  2 Aug 2006 10:31:35 -0600
> Source: cheesetracker
> Binary: cheesetracker
> Architecture: source i386
> Version: 0.9.9-6
> Distribution: unstable
> Urgency: high (security)
> Maintainer: Wesley J. Landaker <wjl@icecavern.net>
> Changed-By: Wesley J. Landaker <wjl@icecavern.net>

And the "Urgency" field matches Debian policy 5.6.17, where it explicitly 
states: "It consists of a single keyword usually taking one of the values 
low, medium or high (not case-sensitive) followed by an optional commentary 
(separated by a space) which is usually in parentheses."

Is this a bug, or am I actually just missing something here?