From: Nobuyoshi Nakada <nobu@...>
Date: 2006-04-11T09:15:35+09:00
Subject: Re: [ ruby-Bugs-4060 ] Array#- fails on arrays of user-defined classes

HI,

2006/4/11, noreply@rubyforge.org <noreply@rubyforge.org>:
> Summary: Array#- fails on arrays of user-defined classes
>
> Initial Comment:
> Array#- does't appear to use ==, === or eql?.  I think it uses something below the ruby level.

It uses hash to get unique elements, so you have to re-define #hash
and #eql? methods properly.

--
nobu.nakada