unbound method equality

unbound_method.rb

class C1
  def meth
  end
end

class C2 < C1
  def meth
  end
end

p C1.instance_method(:meth) == C2.instance_method(:meth).super_method # => true

module M1
  def meth
  end
end

class C3
  include M1

  def meth
  end
end

p M1.instance_method(:meth)              # => #<UnboundMethod: M1#meth>
p C3.instance_method(:meth).super_method # => #<UnboundMethod: M1#meth>

p M1.instance_method(:meth) == C3.instance_method(:meth).super_method # => false (why?)