regarding #328 get_updated_date() should be used for getting atom_updated prior published. On following feed this doesn't work:
in line 9792 always returns the published date.
I'm writing a little follow-up in that issue since apparently this has not been looked at yet.
I'm still having troubles with this.
If you check la-grange's feed today, you will see the last articles all have very different published and updated dates. For example, the last article published as of today:
<link rel="alternate" type="text/html" href="http://www.la-grange.net/2015/08/22/marche"></link><title>L'invitation d'une feuille</title>
I hope this issue can be addressed.