From: Hiro Asari <redmine@...>
Date: 2010-12-09T07:19:41+09:00
Subject: [ruby-core:33643] [Ruby 1.9-Bug#4136] Enumerable#reject should not inherit the receiver's instance variables

Issue #4136 has been updated by Hiro Asari.


In the similar vein, if you subclass Array, that class's #reject returns an object of that subclass, rather than an Array.


$ irb
irb(main):001:0> RUBY_DESCRIPTION
=> "ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]"
irb(main):002:0> class A < Array; def foo; return "yo"; end; end
=> nil
irb(main):003:0> a=A.new
=> []
irb(main):004:0> a.reject {}.foo
=> "yo"
irb(main):005:0> a.collect { true }.foo
NoMethodError: undefined method `foo' for []:Array
	from (irb):5
	from :0

This is counterintuitive, at the least.
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http://redmine.ruby-lang.org/issues/show/4136

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