gistfile1.rb

  def self.coerce_rlimit_resource(resource)
    if resource.is_a?(Symbol) && (const_name = "RLIMIT_#{resource}") && const_defined?(const_name)
      resource = const_get(const_name)
    else
      raise ArgumentError, "invalid resource name #{resource}"
    end
    Rubinius::Type.coerce_to resource, Integer, :to_int
  end

Ah, I see. Yeah, I guess that's a little more concise than initial implementation