[wp-hackers] permalinks trailing slash good or bad?

[jidanni at jidanni.org]

Gentlemen, looking at the models offered on
/wp-admin/options-permalink.php,
"month and name" is /%year%/%monthnum%/%postname%/ ,
But "numeric" is /archives/%post_id% .
Why does one have a trailing slash and the other not?
Shall I employ a trailing slash on a custom format?
I would rather not: looks like "through my carelessness in filling out
the WordPress custom permalinks entry box, I will cause 1000 users to
have to hit one extra character."