The inheritance example is incomplete, as it should do `Editor.prototype.constructor = Editor;` after `Editor.prototype = ..`. Without this, `david.constructor`

The inheritance example is incomplete, as it should do `Editor.prototype.constructor = Editor;` after `Editor.prototype = ..`. Without this, `david.constructor` will be `User`, and a check like `david.constructor === Editor` will yield false. It's not a huge deal, since the class is usually checked with `instanceof`, but it shows that classes in ES5 are quite subtle.