Custom Trait documentation example doesn't work

Specifically this:

https://grapesjs.com/docs/modules/Traits.html#define-new-trait-type

First of all, the keyUp event references onChange when the function name is actually onChange. Next, even if you fix this, this.model.get('value') evaluates to a blank/null value whenever I make changes to it. The only way I can seem to get the actual value is to reference it at e.srcElement.value. That doesn't seem like the correct way to do it though so I would assume something with the get() code is not working right.