title: Django, BigIntegerField, and django.contrib.auth.user.id
body: <p>Django now provides a BigIntegerField for use in django models (available in svn trunk and also 1.2 alpha-1 release).</p>
  
  <p>I need my django.contrib.auth.user model to have a BigIntegerField as its auto-incrementing primary key, whereas it currently uses an auto-incrementing IntegerField as its primary key. Also, wherever contrib.auth.user is used as a ForeginKey, it would need to be BigIntegerField as well.</p>
  
  <p>What is the best and safest way to go about achieving this?</p>