JSONLIterator raises TypeError when using rel seek with a binary file stream

JSONLIterator raises TypeError when using rel seek with a binary file stream: a task in repo2rlenv-swe-next (Harbor dataset). When opening a JSONL file in binary mode ( 'rb' ) and passing it to JSONLIterator with a rel seek argument, a TypeError is raised immediately on construction. The same file…

The task

When opening a JSONL file in binary mode (`'rb'`) and passing it to `JSONLIterator` with a `rel_seek` argument, a `TypeError` is raised immediately on construction. The same file opened in text mode works fine.

Part of FineEnvs/repo2rlenv-swe-next.