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str join() function doesn't work correctly when called with a single argument

str join() function doesn't work correctly when called with a single argument: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). I found an issue with the str join() function when calling it with a single argument. According to the documentation, it should join…

The task

I found an issue with the `str_join()` function when calling it with a single argument. According to the documentation, it should join the given sequence with an empty separator, but it's not working as expected.

Part of keryszhan/harbor-swesmith-rl-artifacts.