Last modified: 2014-04-15 04:06:40 UTC
When a user changes a statement to "no value" or "unknown value" this should be visually different in the diff from other changes. Make them italic. Sample diff: https://www.wikidata.org/w/index.php?title=Q4115189&diff=110740224&oldid=110678853
Fwiw, this bug was part of why I completely misunderstood a set of diffs and posted this query: https://www.wikidata.org/wiki/Wikidata:Project_chat/Archive/2014/04#Problematic_edits_including_Commons_category_unknown_value To make it even more obvious, the diff could be -CustomValue: blah +UnknownValue (that is unified format; obviously the layout is different for two panel diff) In the above presentation, italics would not be necessary.