docs: def Resolve(self, subject, attribute):
      """Retrieve a value set for a subject's attribute.
  
      This method is easy to use but always gets the latest version of the
      attribute. It is more flexible and efficient to use the other Resolve
      methods.
  
      Args:
        subject: The subject URN.
        attribute: The attribute.
  
      Returns:
        A (value, timestamp in microseconds) stored in the datastore cell, or
        (None, 0). Value will be the same type as originally stored with Set().
  
      Raises:
        AccessError: if anything goes wrong.
      """
      for _, value, timestamp in self.ResolveMulti(
          subject, [attribute], timestamp=self.NEWEST_TIMESTAMP):
  
        # Just return the first one.
        return value, timestamp
  
      return (None, 0)