class Roda::RodaPlugins::TypecastParams::Params

def present?(key)
  case key
  when String
    !any(key).nil?
  when Array
    key.all? do |k|
      raise ProgrammerError, "non-String element in array argument passed to present?: #{k.inspect}" unless k.is_a?(String)
      !any(k).nil?
    end
  else
    raise ProgrammerError, "unexpected argument passed to present?: #{key.inspect}"
  end
end