Last modified: 2013-02-20 16:24:22 UTC
Differs can not know by themselves how to determine whether two objects they encounter as values should be considered equal. Per default, they check for object identity only. This should be customizable. Differs could just take a callback as a parameter to their constructor, and use it to compare objects they encounter.
https://gerrit.wikimedia.org/r/#/c/47745/
Verified in Wikidata demo sprint 33