404

I'm using Panels 2 on a site that I'm working on right now, and I've discovered that paths to non-existent pages that begin with the URL of the panel page do not produce a 404.

For example, let's say that this is a page that doesn't exist:

[1] http://example.com/melvin

If I go to that page, I get a 404 Page Not Found response code, and a 404 page is displayed.

Let's say I have a panel page with this URL:

[2] http://example.com/panel1

Now let's say I try to browse to this URL:

[3] http://example.com/panel1/melvin

Hi,

I am using Drupal 5.2, Cleanurls, Pathauto and Global Redirect enabled.
Drupal is throwing correct 404 in most cases, BUT
Drupal doesnt throw 404 for all urls with the following pattern:
http://example.com/myContentType/doesnotexist

You can see this Issue live:
http://drupal.org/forum/doesnotexist

Maybe this could be exploited by someone and hurt your SE rankings.
Has anyone a workaround for this? Or don't you see this as an issue?