From: Brian Buckley <briankbuckley@...>
Date: 2005-12-05T00:59:18+09:00
Subject: Re: need some Ruby magic

> sort_by{ rand } is actually biased, since sort_by will preserve the
> relative order of the elements for which rand() returned the same value.

How frequently would rand return a same value?  (In theory it would be
never but does anyone know the reality?)