class WebMock::Util::ValuesStringifier

def self.stringify_values(value)
  case value
  when String, Numeric, TrueClass, FalseClass
    value.to_s
  when Hash
    Hash[
      value.map do |k, v|
        [k, stringify_values(v)]
      end
    ]
  when Array
    value.map do |v|
      stringify_values(v)
    end
  else
    value
  end
end