title: protractor- difference between toBe(truth) and toBeTruthy()
body: <p>as the title says-
  is there a difference between (for example)</p>
  
  <pre><code> expect(element).isDisplayed().toBeTruthy();
  </code></pre>
  
  <p>and</p>
  
  <pre><code> expect(element).isDisplayed().toBe(truth);
  </code></pre>
  
  <p>and if so what is the difference?</p>
  
  <p>thanks</p>