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Nested Discriminator in allOf

POST 
/discriminator-nested-allof

Tests discriminators nested within allOf structures, where the discriminator and its property definition are inside an allOf item rather than at the top level. This is a common pattern when combining shared properties with discriminated unions.

Schema:

allOf:
  - $ref: '#/components/schemas/CommonProps'
  - oneOf:
      - $ref: '#/components/schemas/NestedVariantA'
      - $ref: '#/components/schemas/NestedVariantB'
    discriminator:
      propertyName: variantType
      mapping:
        variant-a: '#/components/schemas/NestedVariantA'
        variant-b: '#/components/schemas/NestedVariantB'

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