force or remove trailing slash: duplicate cache issue

[eluser]oliverkalen[/eluser]
I would like to force consistency in my URI's to prevent duplicate cache entries

http://website.com/uri/here
http://website.com/uri/here/

Visiting both of these pages will create 2 separate cache entries. My mod_rewrite in htaccess currently looks like:

RewriteEngine On
RewriteBase /baseurl/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

Is there a mod_rewrite solution to this? or will it need to be done through CI?
I can deal with/without the trailing slash - whichever is easier.

Thanks!