string `YES` or `NO` is being converted to boolean `true` or `false`

[yidongw]

Describe the bug A clear and concise description of what the bug is. If you write the string YES or NO in the example, it will be automatically converted to boolean true or false You can find that in the request.openapi.schema.responses[code]["content"]["application/vnd.api+json"]["examples"]

To Reproduce Steps to reproduce the behavior.

    this.app.use(
      OpenApiValidator.middleware({
        apiSpec: this.openApiPath,
        operationHandlers: path.join(__dirname),
        fileUploader: { dest: config.FILE_UPLOAD_PATH },
        $refParser: {
          mode: 'dereference',
        }
      })
    )

Actual behavior A clear and concise description of what happens. string YES or NO is being converted to boolean true or false

Expected behavior A clear and concise description of what you expected to happen. They should not be converted since I didn't tell the package to convert it for me...

Examples and context An example or relevant context e.g. an OpenAPI snippet, an Express handler function snippet "express-openapi-validator": "^4.12.14"

paths:
  /answers:
    get:
      operationId: getAnswers
      x-eov-operation-handler: controllers/answersController
      summary: Get answers
      responses:
        '200':
          description: OK
          content:
            application/vnd.api+json:
              examples:
                answer:
                  $ref: '#/components/examples/answer'
components:
  examples:
    answer:
      value:
        data:
          type: answers
          attributes:
            valid: YES
            clear: NO
          relationships:
            Field:
              data:
                type: fields
                id: u785

If I put it as 'YES' or 'NO' then it works

[cedrichan]

In YAML, YES and NO are boolean values, per spec: https://yaml.org/type/bool.html

So you'd have to quote those values as strings: "YES" and "NO"

[alexkrolick]

This should not be the case in newer YAML versions