From: Mathieu Bouchard <matju@...>
Date: 2001-01-15T06:02:08+09:00
Subject: [ruby-talk:9301] Re: Array#===

> Long ago Array#=== is default Object#=== (== Object#==).  It was
> redefined Array#include? in some period since somone had complained an
> Array on when closes should be used for membership test for clean
> programming.  However this change was reverted later.  It was said
> that something like `[0] === [0]' should be true.  For when closes,
> array expansion was introduced as well as method arguments, so Arrays
> can be used for division of chices still.
> This decision was not so concrete that cannot be reverted.  Discussions
> were welcomed but forgotten untill now.
> # ``Your opinion changes the World'' :-)

keep [0] === [0] true. Array#=== could stand for inclusion. By inclusion I
mean not a membership test (and so, not #include?). I mean that

	class Array; def === other
		(self & other) == other
	end end

(well, i think it is it)

matju