I created a pdf for https://github.com/mozilla/pdf.js/pull/14023:
[same_fields(1).pdf](https://github.com/mozilla/pdf.js/files/7168340/same_fields.1.pdf)
The 3 checkboxes have the same name (`Check Box2`) and have the same values (`Off` and `Yes`).
In pdf.js, these checkboxes behave like radio buttons in the same group (which is wrong) because of:
https://github.com/mozilla/pdf.js/commit/1fcffe80349a98378262c8a16f7b50ff34c3fe82
Since they've the same values they must be synced: if one is checked (resp. unchecked) then all others are checked (resp. unchecked).
constructor(parameters) {
    super(parameters, { isRenderable: parameters.renderForms });
  }
  render() {
    this.container.className = "choiceWidgetAnnotation";
    const storage = this.annotationStorage;
    const id = this.data.id;
    
    
    
    
    
    
    
    storage.getValue(id, {
      value:
        this.data.fieldValue.length > 0 ? this.data.fieldValue[0] : undefined,
    });
    let { fontSize } = this.data.defaultAppearanceData;
    if (!fontSize) {
      fontSize = 9;
    }