|daniel added a comment.|
For a 3rd party site, it would not be terribly hard to implement a new entity type that extends the Item type to have an additional immutable string ID. This would be done by a custom extension on top of Wikibase. I don't think we'd deploy such a thin on Wikidata, though - we'd end up with hundreds of such custom types that only differ by a handful of fields, which with it's own slightly different logic.
Cc: Lydia_Pintscher, Micru, Aklapper, daniel, Yurik, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, Wikidata-bugs, aude, Mbch331
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