function mutableForm(form) {
  const view = html`<div>${form}`;
  linkProperties(form, view, ['output'], ['value']);
  view.form = form;
  const input = form.input;
  const setBoxes = (n, v) => {
    const checked = new Set(v);
    n.forEach(n => n.checked = checked.has(n.value));
  };
  
-
  const isCheckbox = input instanceof RadioNodeList && input[0].type === 'checkbox';
  const setValue = isCheckbox ? setBoxes : (n, v) => n.value = v;
+
  const setValue = input instanceof RadioNodeList && input[0].type === 'checkbox'
    ? setBoxes
    : input instanceof HTMLInputElement && input.type === 'checkbox'
      ? (n, v) => {n.checked = !!v}
      : (n, v) => {n.value = v};

  Object.defineProperty(view, 'value', {
    enumerable: true,
    get: () => form.value,
    set: v => {
      setValue(input, v);
-
      const name = input instanceof RadioNodeList ? 'change' : 'input';
+
      const name = input instanceof RadioNodeList || input instanceof HTMLInputElement && input.type === 'checkbox'
        ? 'change'
        : 'input';
      form.dispatchEvent(new Event(name, {bubbles: true}));
    }
  });
  
  return view;
}