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In "4.3.17. [TreatNullAs]", the example says: An ECMAScript implementation implementing the Dog interface would convert a null value assigned to the “name” property ... to the empty string rather than "null": Change "name" to "owner".
https://github.com/heycam/webidl/commit/39ff36586f68f1a74a0d72ae135182bf063e4243