[Rails] Rails 3.1:: Marshal/deMarshal ActiveRecord instance

Hello everyone!

During I probing Rails 3.1.rc1 noticed along the majors many little changes and deprecations.
Most of them (changes and deprecations) easy fixable except ONE:

If we have:
Dog as ActiveRecord class

puppy = Dog.new
puppy.new_record?
=> true
dumped_puppy = Marshal.load(Marshal.dump(puppy))
dumped_puppy.new_record?
=> false

Why?

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