ReactJs: What should the PropTypes be for this.props.children?

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Given a simple component that renders its children:

class ContainerComponent extends Component {
  static propTypes = {
    children: PropTypes.object.isRequired,
  }

  render() {
    return (
      <div>
        {this.props.children}
      </div>
    );
  }
}

export default ContainerComponent;

Question: What should the propType of the children prop be?

When I set it as an object, it fails when I use the component with multiple children:

<ContainerComponent>
  <div>1</div>
  <div>2</div>
</ContainerComponent>

Warning: Failed prop type: Invalid prop children of type array
supplied to ContainerComponent, expected object.

If I set it as an array, it will fail if I give it only one child, i.e.: 

<ContainerComponent>
  <div>1</div>
</ContainerComponent>

Warning: Failed prop type: Invalid prop children of type object
supplied to ContainerComponent, expected array.

Please advise, should I just not bother doing a propTypes check for children elements?

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