From: Mark Abramov <markizko@...>
Date: 2010-06-11T01:00:49+09:00
Subject: Re: comparing objects

Marcin Wolski wrote:
> Rein Henrichs wrote:
>> On 2010-06-10 07:20:03 -0700, Mark Abramov said:
>> 
>>> Mark Abramov wrote:
>>>> [tl;dr]
>>> 
>>> Sorry, guys, didn't notice how I used eql instead of eql?
>>> Btw, without #hash it won't work anyways which I consider *weird* at the
>>> very least.
>> 
>> #hash makes sense for Hash#[] and etc. #eql? makes more sense for
>> Array#&. I too find it odd that both are necessary.
> 
> If two objects are set to be eql?, their hash methods must also return 
> the same value. More details in The Ruby Programming Language book.
> 
> Thus, when you redefine eql?, the hash methods also should be redefined.

http://ruby-doc.org/core-1.8.7/classes/Object.html#M000617
Well, it doesn't say much in core api :(
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