@ApiHeader() schema override behavior

expected-schema.yaml

  /test:
    post:
      operationId: TestController_testRequest
      parameters:
        - name: Journey-Version
          in: header
          description: Journey API version.
          required: false
          schema:
            enum:
              - '1'
            type: string
            default: '1'

generated-schema.yaml

  /test:
    post:
      operationId: TestController_testRequest
      parameters:
        - name: Journey-Version
          in: header
          description: Journey API version.
          required: false
          schema:
            enum:
              - '1'
            type: string

test.controller.ts

import { Controller, Headers } from '@nestjs/common';
import { ApiHeader } from '@nestjs/swagger';

@Controller()
export class TestController {
  @Post('test')
  @ApiHeader({
    name: 'Journey-Version',
    description: 'API version',
    enum: ['1'],
    schema: {
      default: '1',
    }
  })
  async testRequest(
    @Headers('Journey-Version') versionId?: string,
  ) {
    // endpoint
  }
}