The problem is outlined here:
https://lists.wikimedia.org/pipermail/wikidata-tech/2014-September/000575.html
Issue in the relevant component:
https://github.com/wmde/WikibaseDataModelSerialization/issues/77
Version: unspecified
Severity: major
Whiteboard: u=dev c=backend p=2 s=2014-09-23
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | None | T88728 Improve Wikimedia dumping infrastructure | |||
| Open | None | T88991 improve Wikidata dumps [tracking] | |||
| Invalid | None | T109969 Wikidata breaking API changes (tracking) | |||
| Resolved | JanZerebecki | T73349 [Bug] Fix empty map serialization behaviour | |||
| Resolved | None | T72606 Add ability to output objects instead of arrays for maps in WikibaseDataModelSerialization to not confuse them with lists when they are empty |
Place where a serializer maybe can be told to differentiate for json output: extensions/Wikibase.git/repo/includes/api/ApiHelperFactory.php getSerializerFactory()