[xwiki-devs] XWikiDocument#get/setUser/Creator/ContentAuthorReference() and guest

Hi devs, Following http://markmail.org/message/snnlesexie4ox3i5 I would like to modify user related methods in XWikiDocument to behave like the what has been voted for XWikiContext and follow the same logic. As a reminder here it is: not logged in user (guest) reference is null. Plain and simple. The idea would be to do exactly the same thing than XWikiContext meaning that old String APIs continue to deal with "XWikiGuest" and do convertions for retro compatibility especially with existing databases. It will change the behavior of XWikiDocument#getUserReference() from external point of view so it's a breakage but we might actually fix more bugs than we create when thinking about codes like context.setUserRefererence(document.getAuthorReference()) or $context.userReference == $doc.authorReference which I'm sure we can find here and there. 5.0 and new right service is a good occasion for this improvement. WDYT ? Here is my +1 -- Thomas Mortagne