Enum properties are not being serialized correctly

[hbelmiro]

Given the following OpenAPI document:

openapi: 3.0.3
info:
  title: echo
  version: '1.0.0'
  description: ""
paths:
  /echo:
    post:
      summary: Echo
      operationId: echo
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Message"
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Echo'
components:
  schemas:
    Echo:
      type: object
      properties:
        echoedMsgType:
          type: string
    Message:
      type: object
      required:
        - msgType
      properties:
        msgType:
          type: string
          enum:
            - 'text'

The msgType property is not serialized correctly and the request is sent with the enum name (TEXT) in the JSON rather than the enum value (text).

      properties:
        msgType:
          type: string
          enum:
            - 'text'

Generated enum:

    public enum MsgTypeEnum {
        TEXT("text");
        ...