[Sealed unions] Make `toString` backward compatible#2753

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mpritham wants to merge 7 commits intodevelopfrom

mpritham/sealed-unions-toString-p2

Commits on Dec 18, 2025

Add basic test to validate sealed unions are serialized the same way as legacy unions
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review change: move test
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review change
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wip
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Add docstring
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review changes
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Update unknown variant toString
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