class Array
  # Wraps the object in an Array unless it's an Array.  Converts the
  # object to an Array using #to_ary if it implements that.
  def self.wrap(object)
    case object
    when nil
      []
    when self
      object
    else
      if object.respond_to?(:to_ary)
        object.to_ary
      else
        [object]
      end
    end
  end
end