Infinite loop caused by typed for-loop variable when looping through PackedDataContainer

[Rubonnek]

Tested versions

ffc41fb - reproducible
4.2.1 - reproducible

System information

Godot v4.3.dev (55ebf09ea) - Arch Linux #1 SMP PREEMPT_DYNAMIC Sun, 03 Mar 2024 00:30:36 +0000 - Tty - GLES3 (Compatibility) - AMD Radeon RX 6900 XT (radeonsi, navi21, LLVM 17.0.6, DRM 3.57, 6.7.8-arch1-1) () - AMD Ryzen 9 5950X 16-Core Processor (32 Threads)

Issue description

When looping through a PackedDataContainer whose members should only be of type PackedDataContainerRef, specifying the latter as the type of a for-loop variable will cause an infinite loop when looping through the elements.

Steps to reproduce

Run the MRP.

The infinite loop is caused by ref : PackedDataContainerRef . Replacing that with just ref fixes the issue.

Minimal reproduction project (MRP)

TypedPDCRBug.zip

[AThousandShips]

While the infinite error shouldn't happen, the data in it isn't guaranteed to just be the ref AFAIK, that's just with nested cases, so that part isn't a bug, the bug is the iteration breaking

As per the documentation:

Nested containers will be packed recursively. While iterating, they will be returned as PackedDataContainerRef.

This is probably because the iteration uses the empty/invalid value to start iteration, and therefore it will break if the value is invalud