fix(engine): set_null on a multiple:true reference removes the deleted member; emptied set stored as [], never null; drop the #9437 interim 409 hold - #9520

fix(engine): set_null on a multiple:true reference removes the deleted member; emptied set stored as [], never null; drop the #9437 interim 409 hold#9520

os-zhuang merged 1 commit into

mainobjectstack-ai/objectstack:mainfrom

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