Improve ?source stripping

[mal0ki]

So what Mastodon does right now is strip referer codes on links, which is all good and well, unless you want to share something called a "friends_link" via say Medium. These friends links are great because it allows you to share a version of your post to your friends so they don't have that article count towards their paywall limit (which is 5 articles).

However, with Mastodon stripping this we end up not being able to share that (even in DMs).

I know that there are arguments against Medium, and they are quite obvious, but if we can use friends_link referers in order to know that we're not contributing to the paywall issue, wouldn't we want to do that?

Suggestion: Add an exception to the current "strip ?source= code", for "=friends_link"