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 (DOMProperty.shouldSetAttribute(propKey, nextProp)) {
          if ((propertyInfo = DOMProperty.getPropertyInfo(propKey))) {
            
            extraAttributeNames.delete(propertyInfo.attributeName);
            serverValue = DOMPropertyOperations.getValueForProperty(
              domElement,
              propKey,
              nextProp,
            );
          } else {