Re: how do I convince Hash that two keys are the same?

irb(main):007:0> class Blah; def initialize n; @n = n; end; def foo; 
self.class.new 20; end; end
=> nil
irb(main):008:0> class Boo < Blah; end
=> nil
irb(main):009:0> Boo.new(100).foo
=> #<Boo:0x5f7f0 @n=20>

Alex