From: Wilson Bilkovich <wilsonb@...>
Date: 2010-06-06T08:18:15+09:00
Subject: Re: comparing objects

On Sat, Jun 5, 2010 at 4:09 PM, Robert Dober <robert.dober@gmail.com> wrote:
> I must have made a stupid mistake in my example code, however, this is
> no reason to mess with #eql? and #hash, Be warned.
> In that case I stick with Robert's advice: Do not use Array#&, even
> MPing Array with something like #intersect_by would be preferable.

Implementing this behavior with your own object types is the whole
point of the Ruby core API.
I find myself struggling to understand the mindset that would prefer
re-opening Array and adding something over using the
already-there-for-a-reason Enumerable and Array interfaces.

Using eql? and hash is not 'messing with' them, unless you don't take
the time to understand your tools.