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Allow to work with production Webpack build. (#9)

Apparently, when a class explicitly extends object like this:

```javascript
class Thing extends Object {

}
````

It is completely erased by webpack production build and replaced by
the object constructor. In other words

```javascript
new Thing() instanceof Thing //=> false
```

This feels like a pretty big bug in webpack, but it is easily fixed
enough by making the base class of a union default to an empty class
`class {}` instead of `Object`

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