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allOf override of nested array items with oneOf

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/allof-array-items-oneof-override

Regression coverage for issue #1218.

A schema extends a base via allOf and overrides a nested array's items with a oneOf of subtypes that each include the base's properties. Prior to the fix, the shared base properties (id, type, geometry) rendered twice — once at the array-item level and once inside each oneOf branch.

Schema:

type: object
allOf:
  - $ref: '#/components/schemas/FeatureCollectionBase'
  - type: object
    properties:
      features:
        items:
          oneOf:
            - $ref: '#/components/schemas/PointFeature'
            - $ref: '#/components/schemas/PolygonFeature'

Responses​

A custom feature collection