>>>>> "D" == Dave Thomas <Dave / PragmaticProgrammer.com> writes:

D>                                                        I'm guessing
D> that the Foo object is undergoing the same treatment, and therefore
D> that Ruby can't tell the resulting copied key from the next "hello"
D> that comes along.

 In reality this is because you can't change String#hash.

  Well, you can, but ruby will not use it internally (this was why I've
said "but don't try to redefine #hash for String" in [ruby-talk:8034])


Guy Decoux