String.true?欲しい

gistfile1.rb

class String
  def true?
    self == 'true' || self == '1'
  end
  def false?
    self == 'false' || self == '0'
  end
end

[35] pry(main)> 'true'.true?
=> true
[33] pry(main)> 'false'.false?
=> true
[34] pry(main)> 'true'.false?
=> false
[36] pry(main)> '1'.true?
=> true
[37] pry(main)> '0'.true?
=> false