title: GA Enhanced Ecommerce: using string value for the Step field instead of a numeric value
body: <p>With Google Analytics Enhanced Ecommerce, can I use a <em>string value</em> for the <code>step</code> field, in measuring <a href="https://developers.google.com/analytics/devguides/collection/analyticsjs/enhanced-ecommerce#measuring-checkout" rel="nofollow">checkout process</a>, instead of using a numeric (integer) value?</p>
  
  <p>Something like this:</p>
  
  <pre><code>ga('ec:setAction','checkout', {
    // Instead of: 'step': 1,
    'step': 'login',
  });
  
  //
  
  ga('ec:setAction','checkout', {
    // Instead of: 'step': 2,
    'step': 'shipping_method',
  });
  </code></pre>