We used to throw if event listener is not a function in Stack:

```js
ReactDOM.render(
  <h1 onClick={{}}>Hello World!</h1>,
  document.getElementById('container')
);
```

<img width="565" alt="screen shot 2017-08-08 at 3 41 08 pm" src="https://user-images.githubusercontent.com/810438/29077502-2646412e-7c50-11e7-8c99-3b7f6c0a2589.png">

Fiber silently ignores this.

I think we should throw. This would let us add support for objects (e.g. for passive listener configuration) if we want to in a minor rather than a major.
}
    } else if (propKey === SUPPRESS_CONTENT_EDITABLE_WARNING) {
      
    } else if (registrationNameModules.hasOwnProperty(propKey)) {
      if (nextProp) {
        ensureListeningTo(rootContainerElement, propKey);
      }
    } else if (isCustomComponentTag) {
      DOMPropertyOperations.setValueForAttribute(domElement, propKey, nextProp);
    } else if (nextProp != null) {
      
      
      
      DOMPropertyOperations.setValueForProperty(domElement, propKey, nextProp);
    }
  }
}
function updateDOMProperties(
  domElement: Element,
  updatePayload: Array<any>,
  wasCustomComponentTag: boolean,
  isCustomComponentTag: boolean,
): void {
  
  for (var i = 0; i < updatePayload.length; i += 2) {
    var propKey = updatePayload[i];
    var propValue = updatePayload[i + 1];
    if (propKey === STYLE) {
      CSSPropertyOperations.setValueForStyles(domElement, propValue);
    } else if (propKey === DANGEROUSLY_SET_INNER_HTML) {