I was commenting about redirecting non-www to www urls, (on this question) and posted two urls in a comment, one with, and one without www, both including the protocol (http).
Both urls were parsed into links (fine) but the display of both was shortened to exclude both the protocol (fine), and the sub-domain (here's the problem) - although it was preserved in the href/target of the link.
I assume this is to save space in comments. I also know that Jeff doesn't like sub-domains on his own websites (http://stackoverflow.com for example), but most of the web still uses them, and they are relevant. Should/could url sub-domains be preserved in comments?
Edit: I just did a little experiment in the comments to this question. It seems "www" is removed, but any other sub-domain is preserved. This is good, but it still strikes me as a little aggressive, just to save 4 characters of space in the comments?