How to allow quotes (“) or ” in post slugs

I’m migrating a Joomla site to WordPress. Many of my old posts have quotes (or %22) in the post slug . How can I modify WP to allow these?

I’ve tried adding a “%22” directly into the post slug form. It goes into the database fine, but when I actually try and click on the link from the index page, I get a 404 error.

I’m having a hard time tracking down where the translation from URLS to database queries happens for posts. I’m assuming that’s where I’d have to make the change, as there is probably some stripping going on.