4f00a470cd
- Add a custom Iterator, so it can be iterated as a 1D list. - Add missing functions like `first`, `is_empty`, `clear`, and subscript operator. - Add a `size_` member variable for faster `size` calls. - Add compile-time asserts to ensure the Capacity sizes are valid. - Add unit tests. See #138947 for the motivation behind this. Pull Request: https://projects.blender.org/blender/blender/pulls/139102