From: Zachary Scott <zachary@...>
Date: 2011-12-30T23:49:26+09:00
Subject: Re: What’s the standard way of implementing #hash for value objects in Ruby?

> This was the main reason for releasing Ruby 1.8.7p357.
>

Oh, I hadn't realized until I just checked ruby-lang.org

http://www.ruby-lang.org/en/news/2011/12/28/denial-of-service-attack-was-found-for-rubys-hash-algorithm/