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/usr/lib/ruby/vendor_ruby/active_support/core_ext/duplicable.rb is in ruby-activesupport-2.3 2.3.14-2.

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class Object
  # Can you safely .dup this object?
  # False for nil, false, true, symbols, and numbers; true otherwise.
  def duplicable?
    true
  end
end

class NilClass #:nodoc:
  def duplicable?
    false
  end
end

class FalseClass #:nodoc:
  def duplicable?
    false
  end
end

class TrueClass #:nodoc:
  def duplicable?
    false
  end
end

class Symbol #:nodoc:
  def duplicable?
    false
  end
end

class Numeric #:nodoc:
  def duplicable?
    false
  end
end

class Class #:nodoc:
  def duplicable?
    false
  end
end