title: Do Ruby 1.8 and 1.9 have the same hash code for a string?
body: <p>I want to use <code>String.hash</code> to generate the hash code, but I'm worried that if some time later I upgrade the version from 1.8 to 1.9, the hash code generated will also change.</p>
  
  <p>Do Ruby 1.8 and 1.9 have the same hash code for a string?  </p>