whole_func_string: function collapsable(node) {
    return (
      is('text', node) ||
      element(node, list) ||
      embedded(node) ||
      bodyOK(node) ||
      (element(node, 'meta') && has(node, 'itemProp'))
    )
  }
func_code_string: function collapsable(node) {
    return (
      is('text', node) ||
      element(node, list) ||
      embedded(node) ||
      bodyOK(node) ||
      (element(node, 'meta') && has(node, 'itemProp'))
    )
  }
func_documentation_string: Check if `node` is collapsable.