Call the changedHandler after the value has been set

I'm submitting a feature request

• Library Version:
  1.1.0

Please tell us about your environment:

• Operating System:
  all

• Node Version:
  all

• NPM Version:
  all

• JSPM OR Webpack AND Version
  both

• Browser:
  all

• Language:
  all

Current behavior:
Whenever we subscribe to a part of the state, the changed handler will be called before the actual state is changed.

@autoinject()
@connectTo({
  selector: {
    list: store => store.state.pipe(pluck('list'))
  }
})
export class App {
  store;
  list : string[] = [];
  normalBinding : string;

  constructor(store : Store<any>) {
    this.store = store;
    this.store.registerAction('addList', addList);
  }

  listChanged(newValue, oldValue) {
    // this.list does not have the newValue yet, in contrast with normal 
    // aurelia behavior where this.list would have the value when this handler is called
  }

   normalBindingChanged(newValue, oldValue){
     // this.normalBinding is already set at this moment
   }
  }
}

• What is the expected behavior?
  The bound value should be set before the changed-handler is invoked

• What is the motivation / use case for changing the behavior?
  It aligns better with the default Aurelia behavior and meets the expectations of users better

Start with the @connectTo selector example and trace how the selected list value reaches listChanged. Add a regression test showing that the bound value is updated before its changed handler runs, then verify the existing behavior remains intact.