`allOf` with redundant `type` causes the type to be `serde_json::Value` when it should be the full type

[mwja]

Version or commit

openapi-to-rust 0.12.1

Affected area

Generated models

Minimal OpenAPI fragment

openapi: "3.1.0"
info:
  title: repro
  version: "1"
paths: {}
components:
  schemas:
    Widget:
      type: object
      allOf:
        - $ref: "#/components/schemas/WidgetBase"
        - $ref: "#/components/schemas/WidgetExtra"
    WidgetBase:
      type: object
      properties:
        id:
          type: string
    WidgetExtra:
      type: object
      properties:
        name:
          type: string

Configuration and command

openapi-to-rust generate repro-minimal.yaml --types-only --output-dir out --module-name repro

Actual behavior

allOf when paired with type: object collapses into serde_json::Value

Expected behavior

it should be a combination of all types involved, similar to anyOf becoming an enum

Environment

macOS 26.5, rustc 1.97.1 (8bab26f4f 2026-07-14), cargo install

Checks

• I removed credentials and private API data.
• I searched existing issues for this behavior.
• This is not a security vulnerability.