Long, long ago, duplicate banners used to be mere markdown in the body of a post. Like, for example, revision 3 on this post
> **Possible Duplicate:** > [particle で versus particle と](https://japanese.stackexchange.com/questions/8107/particle-%e3%81%a7%e3%80%80versus-particle%e3%80%80%e3%81%a8) <!-- End of automatically inserted text -->
Nowadays, of course, duplicate banners are some separate thing - not part of the body of a post.
Would it be possible to convert markdown duplicate banners into real duplicate banners, either as part of some behind-the-scenes batch job, or as part of some magic that happens when one edits a duplicate post that has a markdown banner?
This would also fix this issue, I guess: Shouldn't the closed-as-duplicate banner update when the title of the target changes?.
(Why am I editing duplicate posts that are so old that they predate the current banner system? In this case, to force markdown to be re-baked following this change to the markdown parser: Markdown change: Intra-word emphasis now works. Unlike questions closed for other reasons, I think duplicates ought to be maintained - users may still come across them and find them useful for whatever reason.)