Question about an implementation in packing_iterator.py.

Hi, thank you for sharing this great project!!

I have a question about the below snippet. What is the purpose of these lines?

https://github.com/facebookresearch/blt/blob/6ffeb66b534e8af62692383fdc49d2c22148ea4a/bytelatent/data/iterators/packing_iterator.py#L175-L176

Thank you!

Start by reading lines 175-176 in bytelatent/data/iterators/packing_iterator.py, then inspect the surrounding packing iterator logic to understand how those lines affect iteration. Done means documenting a clear explanation of their purpose for users of the project.

Written by the indexing model from the issue text.