   find: (fun) ->
     return item for item in @ when fun(item)
   insertAt: (index, value) ->
-    mark(@, value)
     Array.prototype.splice.call(@, index, 0, value)
     @length = getLength(@)
     @trigger("insert", index, value)

    value
  push: (element) ->
    @[@length] = element
    mark(@, element)
    @length = getLength(@)
    @trigger("add", element)
    @trigger("change", @)

    value
  deleteAt: (index) ->
    value = @[index]
    Array.prototype.splice.call(@, index, 1)
    @length = getLength(@)
    @trigger("delete", index, value)
