Add backward compatibility for object-typed AdditionalProperties#9516

Merged

JoshLove-msft merged 8 commits intomainfrom

copilot/add-backcompat-support-for-additionalproperties

Jan 30, 2026

Commits on Jan 29, 2026

Initial plan
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Add backward compatibility support for object-typed AdditionalProperties

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JoshLove-msft
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Add test for object-typed AdditionalProperties backward compatibility

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Fixed implementation to use object backing field for backward compatibility

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Add MrwSerializationTypeDefinitionTests for object-typed AdditionalProperties backward compatibility

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Add comprehensive assertions for all deserialization code in backward compatibility test

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Add comprehensive serialization assertions and update backward-compatibility.md

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Run prettier format on backward-compatibility.md

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JoshLove-msft
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