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) {
    const isRenderable =
      parameters.renderForms ||
      (!parameters.data.hasAppearance && !!parameters.data.fieldValue);
    super(parameters, { isRenderable });
  }
  setPropertyOnSiblings(base, key, value, keyInStorage) {
    const storage = this.annotationStorage;
    for (const element of document.getElementsByName(base.name)) {
      if (element !== base) {
        element[key] = value;
        const data = Object.create(null);
        data[keyInStorage] = value;
        storage.setValue(element.getAttribute("id"), data);
      }
    }
  }
  render() {