code: function render(vnode, parent, merge) {
      return diff(merge, vnode, {}, false, parent, false);
    }
docs: Render JSX into a `parent` Element.
  @param {VNode} vnode		A (JSX) VNode to render
  @param {Element} parent		DOM element to render into
  @param {Element} [merge]	Attempt to re-use an existing DOM tree rooted at `merge`
  @public
  
  @example
  // render a div into <body>:
  render(<div id="hello">hello!</div>, document.body);
  
  @example
  // render a "Thing" component into #foo:
  const Thing = ({ name }) => <span>{ name }</span>;
  render(<Thing name="one" />, document.querySelector('#foo'));