Add "created_at" to all ruby objects

created_at.rb

class Class
  alias :create :new

  @@objects = []

  def new(*a, &b)
    obj = allocate
    if obj.class == String
      nil
    elsif obj.class == Time
      nil
    else
      puts obj.class
      obj.instance_variable_set(:@created_at, Time.new)
      @@objects << obj
      if @@objects.length > 10
        @@objects.shift
      end
    end
    obj.class.class_eval do
      define_method("created_at") {"#{Time.new - @created_at} ago"}
    end
    obj.class.class_eval do
      define_method("objects") {@@objects.inspect}
    end
    obj.send(:initialize, *a, &b)
    return obj
  end
end


a = Array.new
b = Hash.new
sleep 1
puts a.created_at.inspect
puts a.objects.inspect