omry / omegaconf / 54ae747b-c90a-4844-84eb-90c43d326a05

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Support Union of Structured Configs (#1354)

Select structured union members by runtime MRO and reject ambiguous untyped mappings.

Keep assignment replacement distinct from merge behavior: same-branch merges preserve existing values, cross-branch merges replace, and selected structured fields retain normal conversion.

Document branch selection, merge, and serialization semantics and cover dataclasses, attrs, containers, interpolation, frozen configs, and mapping branches.

Fixes #1275

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