An internal class used by [PackedDataContainer] to pack nested arrays and dictionaries. When packing nested containers using [PackedDataContainer], they are recursively packed into [PackedDataContainerRef] (only applies to [Array] and [Dictionary]). Their data can be retrieved the same way as from [PackedDataContainer]. [codeblock] var packed = PackedDataContainer.new() packed.pack([1, 2, 3, ["nested1", "nested2"], 4, 5, 6]) for element in packed: if element is PackedDataContainerRef: for subelement in element: print("::", subelement) else: print(element) [/codeblock] Prints: [codeblock lang=text] 1 2 3 ::nested1 ::nested2 4 5 6 [/codeblock] Returns the size of the packed container (see [method Array.size] and [method Dictionary.size]).