message: Fix using old Zippy option
diff: 'discriminator': prop.isDiscriminator,
  'complex': prop._pointer,
  'additional': prop._additional,
  - 'expanded': subSchema.visible
  + 'expanded': subSchema.open
  }">
  <td class="param-name">
  <span class="param-name-wrap" (click)="subSchema.toggle()">
  