Aurelia Validation - Why is ensureObject not being called?

address.js

import { ValidationRules } from 'aurelia-validation';

export class Address {
  street; 
  city;
}

/*ValidationRules
  .ensure(a => a.street).required()
  .ensure(a => a.city).required()
  .on(Address);
  */

app.html

<template>
  <router-view></router-view>
</template>

app.js

import {Router} from 'aurelia-router';


export class App {
  
  router = null;
    
  configureRouter(config, router) {
    this.router = router;
    config.title = 'Aurelia';
    config.map([
      { route: ['', 'home'],       name: 'Home',       moduleId: './home' },
      { route: 'create',       name: 'create',       moduleId: './create' },
      { route: 'edit',        name: 'edit',      moduleId: './edit'}
    ]);
  }
}

bootstrap-form-renderer.js

import {
  ValidationRenderer,
  RenderInstruction,
  ValidationError
} from 'aurelia-validation';

export class BootstrapFormRenderer {
  render(instruction) {
    for (let { error, elements } of instruction.unrender) {
      for (let element of elements) {
        this.remove(element, error);
      }
    }

    for (let { error, elements } of instruction.render) {
      for (let element of elements) {
        this.add(element, error);
      }
    }
  }

  add(element, error) {
    const formGroup = element.closest('.form-group');
    if (!formGroup || formGroup.classList.contains('hide-error')) {
      return;
    }

    // add the has-error class to the enclosing form-group div
    formGroup.classList.add('has-error');

    // add help-block
    const message = document.createElement('span');
    message.className = 'help-block validation-message';
    message.textContent = error.message;
    message.id = `validation-message-${error.id}`;
    formGroup.appendChild(message);
  }

  remove(element, error) {
    const formGroup = element.closest('.form-group');
    if (!formGroup) {
      return;
    }

    // remove help-block
    const message = formGroup.querySelector(`#validation-message-${error.id}`);
    if (message) {
      formGroup.removeChild(message);

      // remove the has-error class from the enclosing form-group div
      if (formGroup.querySelectorAll('.help-block.validation-message').length === 0) {
        formGroup.classList.remove('has-error');
      }
    }
  }
}

create.html

<template>
  <form submit.delegate="submit()">

    <h1>${title}</h1>
    <div class="form-group">
      <label class="control-label" for="last">Name</label>
      <input type="text" class="form-control" placeholder="Name"
             value.bind="driver.name & validate">
    </div>
    
    <div class="form-group">
      <label class="control-label" for="last">Custom address? ${driver.customAddress}</label>
      <input type="checkbox" checked.bind="driver.customAddress">
    </div>
    
    <hr>
    
    <h4>Custom address</h4>
    <div class="form-group">
      <label class="control-label" for="last">Street</label>
      <input type="text" class="form-control" placeholder="Street"
             value.bind="driver.address.street & validate">
    </div>
    <div class="form-group">
      <label class="control-label" for="last">City</label>
      <input type="text" class="form-control" placeholder="Street"
             value.bind="driver.address.city & validate">
    </div>
    
    <button type="submit" class="btn btn-primary">Submit</button>
    <button class="btn btn-danger" click.delegate="back()">Back</button>
  </form>
  
  <ul repeat.for='e of controller.errors'>
    <li>${e.message}</li>
  </ul>
  
</template>

create.js

import {Driver} from './driver';
import {inject, NewInstance} from 'aurelia-framework';
import {Router} from 'aurelia-router';
import {ValidationController,ValidationRules} from 'aurelia-validation';
import {BootstrapFormRenderer} from './bootstrap-form-renderer';

@inject(NewInstance.of(ValidationController), Router)
export class Create {
    
  title = 'Create';
  controller = null;
  router = null;
  driver = new Driver();
  
  constructor(controller, router) {
    this.controller = controller;
    this.controller.addRenderer(new BootstrapFormRenderer());
    this.router = router;
    
    ValidationRules
    .ensureObject()
      .satisfies(obj => false) 
      .withMessage('Both street and city are required')
      //.when(d => d.customAddress===true)
    .ensure(d => d.name)
        .required()
    .on(this.driver);

  }
  
  submit () {
    this.controller.validate();
  }
  
  back() {
    this.router.navigateToRoute('Home');
  }
}

driver.js

import { ValidationRules } from 'aurelia-validation';
import {Address} from './address';

export class Driver {
  name;
  address = new Address();
  customAddress = false;
}

ValidationRules
  .ensureObject()
      .satisfies(obj => { console.log('OBJ', obj); return false } ) 
      .withMessage('Both street and city are required')
      //.when(d => d.customAddress===true)
  .ensure(d => d.name)
      .required()
  .on(Driver);

edit.html

<template>
  <form submit.delegate="submit()">

    <h1>${title}</h1>
    <div class="form-group">
      <label class="control-label" for="last">Name</label>
      <input type="text" class="form-control" placeholder="Name"
             value.bind="driver.name & validate">
    </div>
    
    <div class="form-group">
      <label class="control-label" for="last">Custom address? ${driver.customAddress}</label>
      <input type="checkbox" checked.bind="driver.customAddress">
    </div>
    
    <hr>
    
    <h4>Custom address</h4>
    <div class="form-group">
      <label class="control-label" for="last">Street</label>
      <input type="text" class="form-control" placeholder="Street"
             value.bind="driver.address.street & validate">
    </div>
    <div class="form-group">
      <label class="control-label" for="last">City</label>
      <input type="text" class="form-control" placeholder="Street"
             value.bind="driver.address.city & validate">
    </div>
    
    <button type="submit" class="btn btn-primary">Submit</button>
    <button class="btn btn-danger" click.delegate="back()">Back</button>
  </form>
</template>

edit.js

import {inject, NewInstance} from 'aurelia-framework';
import {Router} from 'aurelia-router';
import {Driver} from './driver';
import {ValidationController} from 'aurelia-validation';
import {BootstrapFormRenderer} from './bootstrap-form-renderer';

@inject(NewInstance.of(ValidationController), Router)
export class Edit {
  
  title = "Edit"
  router = null;
  controller = null;
  driver = new Driver();
  
  constructor(controller, router) {
    this.controller = controller;
    this.controller.addRenderer(new BootstrapFormRenderer());
    this.router = router;
  }
  
  submit () {
    this.controller.validate();
  }
  
  back() {
    this.router.navigateToRoute('Home');
  }
}

home.html

<template>
  
  <h1>${title}</h1>
  
  <button class="btn btn-primary" click.delegate="navigateTo('create')">Create</button>
  <button class="btn btn-primary" click.delegate="navigateTo('edit')">Edit</button>
</template>

home.js

import {inject} from 'aurelia-framework';
import {Router} from 'aurelia-router';

@inject(Router)
export class Home {
  
  router = null;
  
  constructor(router) {
    this.router = router;
  }
  
  navigateTo(route) {
    this.router.navigateToRoute(route);
  }
  
  title = 'Home page';
}

index.html

<!doctype html>
<html>
  <head>
    <title>Aurelia</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
  </head>
  <body aurelia-app="main" class="container">
    <h1>Loading...</h1>
    
    <script src="https://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/config.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script>
    <script>
      require(['aurelia-bootstrapper']);
    </script>
  </body>
</html>

main.js

export function configure(aurelia) {
  aurelia.use
    .standardConfiguration()
    //.developmentLogging()
    .plugin('aurelia-validation');

  aurelia.start().then(() => aurelia.setRoot());
}