From: Yusuke Endoh <redmine@...>
Date: 2010-05-03T17:11:50+09:00
Subject: [ruby-core:29955] [Bug #3222] Can bignums have singleton class & methods?

Issue #3222 has been updated by Yusuke Endoh.

Assigned to set to Yukihiro Matsumoto
Target version changed from 1.9.2 to 1.9.x

Hi,

I think this is not a bug.

It is still possible to define method to Bignum by redefining
singleton_method_added first:

  x = (1 << 64)
  def x.singleton_method_added(x)
  end
  def x.foo
    p 1
  end
  x.foo  #=> 1

Matz actually fixed #601, but he was not keen to fix this kind
of issue.  [ruby-dev:36778]
In fact, the above loophole is indicated by matz himself.


I agree that Ruby should disallow access to the singleton class
completely, but I don't know if it is easy or not.
Anyway, we should discuss this matter towards 1.9.3 or later.
I move this ticket to Feature tracker.

-- 
Yusuke Endoh <mame@tsg.ne.jp>
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