title: Capybara specs fails after opal js update?
body: <p>Previously I used to load opal.js, opal-parser.js, opal-jquery.js(version 0.3x). Now I added gem opal and opal-rails(version 0.6.2) instead of js files. </p>
  
  <p>Previously my whole test suit(capybara + rspec) used to passed but after update capybara specs start failing. Sometime it behave wired(i.e passed in firefox but fail in chrome). </p>
  
  <p>One of the example error is </p>
  
  <p><code>unknown error: Runtime.evaluate threw exception: RangeError: Maximum call stack size exceeded</code></p>
  
  <p>It is said that there is compatibility issue with opal and rspec. </p>
  
  <p>I will be grateful if someone help me fixing this issue.</p>