prelude: |
  class String
    def freeze
      -self
    end
  end
benchmark:
  vm2_freezestring: |
    "tXnL1BP5T1WPXMjuFNLQtallEtRcay1t2lHtJSrlVsDgvunlbtfpr/DGdH0NGYE9".freeze
loop_count: 6000000