Does implicit return in ruby violate encapsulation?

implicit_return_encapsulation_issues.rb

class Outer
  class Inner
    def initialize(attrs)
      @obj = attrs
    end
    
    def do_something
      # do somehting with the @obj
      @obj
    end
  end
  
  def do_something
    x = Inner.new(:foo => 'bar')
    x.do_something
  end
end

o1 = Outer.new
i1 = o1.do_something
i1.delete(:foo) # dangerous. Probably could have been avoided if Outer#do_something returned self at the end