Ruby on Rails

Look the below code with Object#clone:

foo = Object.new
def foo.bar
"hi"
end
baz = foo.clone
foo.bar # => "hi"
baz.bar # => "hi"

Now with Object#dup

foo = Object.new
def foo.bar
"hi"
end
baz = foo.dup
foo.bar # => "hi"
baz.bar # `<main>': undefined method `bar' for #<Object:0x989b378>
(NoMethodError)

Why the below part didn't work.

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