title: assert that an object is an integer number
body: <p>Using <a href="https://github.com/shouldjs/should.js" rel="nofollow noreferrer">should.js</a>, I am currently doing:</p>
  
  <pre><code>ordinal.should.be.a.Number().and.equal(Math.floor(ordinal)); 
  </code></pre>
  
  <p>&hellip; is there a more concise way to require that a given object be an integer?</p>