I've just noticed that there appears to be a bug when trying to write an inline link in a comment using markdown. If the URL contains a
http:// in the path component of the URI, things go wonky.
For example, I tried to include a link to a page archived on archive.org:
Read the [archived version on archive.org](http://web.archive.org/web/20071102233627/http://xooglers.blogspot.com/2005/12/lets-get-real-database.html)
This rendered as:
Read the xooglers.blogspot.com/2005/12/…" rel="nofollow">archived version on archive.org
In this specific case, you can manually edit the URL and drop the
http:// from the path and archive.org still works, but that feels like a hacky fix.